
People are not stupid, most of them. So justifying Kana's actions over and over does not invalidate the matter at hand.
They are not saying they don't understand her behavior. They are displeased by it. Understanding someone and condemning their actions are different. Kana's actions are not rocket science.
Regardless of her reasons, what she did, for various reasons, can be inherently offending. Her actions vs her intentions. Her actions is the turmoil for some. And clearly, many seem to have deep rooted issues with corpse slappers.
If Aqua was my own son and that wannabe slapped my child at his funeral, hatred would not be the only feeling I would spare her. Regardless how much sentimentalism one wishes to paint this action, what she did was very tactless.
Finally, I am not suggesting that hating Kana should be the default reaction, but questions like "why is she being hated" are pretty... void, because the answer is blatantly obvious.
Personally, Kana's bratty attitude has always pissed me off since day one. At this point, I am used to her rudeness knowing no limits.

Miyako also slapped her in return, no one is justifying her behavior but "a lot of people" don't even try to understand whats happening, specially since this manga has the particularity of having a bunch of people that doesn't even understand or try to understand the characters, and it shows with them falling for some of the most simple of red herrings multiple times in the story, or how for them Aqua is either just an evil brat that takes advantage of women instead of the complicated character he is. YES you say is no that deep for some people can't even grasp that.
Also to me is not void, because what Kana is doing is not weird, and at least in my case, we don't start to "cancel her" for this kind of thing that happens all the time during funerals, so yeah, excuse me if I just want to understand why people just tend to see this as a black or white situation.

At first i felt like aqua and ruby when i saw kana, later when they grew up i didn't feel anything towards her. She was an unimportant character to me in the manga, every time she was shown i wished it would end soon because like i said her being there seemed so uninteresting it felt like it was all about her. Even if it was the manga that i was reading just her speaking looked like she was screaming(and felt like i could hear her even if there wasn't a voice to begin with), since she was so loud it seemed as if the manga was all about her and her childish tantrums and as if everybody should suit her spoiled taste. Thats when she started to annoy me, i was like "why is she here" but still she wasn't someone i liked or disliked she wasn't even someone i loved or hated she was just an irrelevant person that i was waiting to leave and for the story to keep going, but she never left and the story somehow still was going but do you know what? The story felt like it wasn't moving with kana, the story went on and when kana showed up it stopped and as if to suit her it said something in favour of her and then continued. To this day i feel nothing towards her, when people say that aqua should get with kana, i am like" why? " and people say the same things, she is different(but no one in the manga was the same), she is the light(ai was on the darker side but we all loved her), she is cute(here i agree but as you can see there are a lot of good looking characters), she had a harsh past(yeah but so did the others but their pain is disregarded even if they had it worse and what does this add to the ship), aqua helped her(he helped others too), he smiled at her(he has smiled at others with even a more genuine smile), he forgets his past when he is with her(because he hasn't told her and that's why he feels that he want be judged, its not that he forgets), he that, he this, what about everything else, he used her at the beginning when they met, he even used her to form a group for his sister and he used her again later, he hurt her when he was having a panic but still didn't tell her why?, he never said what he feels about her not even thought about it tell me why is memo-chan needed to tell me that he has an obsession with kana(not to mention that she thought that because of the panic aqua was having on the thought of his mother's death, and she thought it was only about kana, but as seen when he stops ruby from becoming an idol he just has a strong hatred for the things that brings being an idol), why does akane needs to say what aqua feels(when even though she is smart she is an unreliable source when it comes to love because she doesn't understand it until later on and even then she is as reliable as ai was), why did it need goro to question it(when he never even understood the real aqua) why have i never heard(read) him say anything(straightforward) about his feelings, but i will blame aka for this for wanting it to be as if he was making some kind of plot twist or something. Kana on the other hand was never a good choice, some say she got character development but she just got humbled when she saw how many others were above her and how bad her character made her look otherwise she wouldn't care. She is not considerate about others feelings only if she is feeling good or at least not more down than the others thats the only time she will listen(like you could guess not many times) and even then the comments she gives are hurtful and unnecessary to the topic. Oo but what about the time that kana helped ruby play as ai so good she even played the villain fir that, no she just spoke her honest feelings, did it help ruby? Yes is she a selfish character? Yes, they were her true feelings, though we know she also loves ruby. Her love for aqua came out of nowhere (since childhood when they were kids some say) and even if she had feelings for him since they were children when they met once, her feelings were way up the moment they met going to even imagine wierd stuff(it was way to much, for no apparent reason). She was way to selfish even when aqua got in a relationship and somehow people had to be careful not to anger her as if she had any right over aqua( even ignoring him or calling him stupid/ idiot and so on), she acts as if she is some kind of big shot every time and while thats fine it would be better for you to do it while not bringing people down. I want to talk more but i will say one more thing cause this is to much already, and it's about the slap, she promised to slap him only if he committed suicide not if he got murdered and even if he did the first it's disrespectful of her to lay hands on him, while she is only his friend( her feelings are relevant but she had no right slapping him) you don't touch somebodies family like that in front of them(but the thing is that no one even family should harm a dead body).

It's your assumption that people don't understand her. People don't feel the need to be melodramatic over a character who LITERALLY exposes her whole thought process. Understanding Kana is not a big brain move, she LITERALLY tells us how she feels. Every character in that story pretty much exposes their thought process, later or sooner. Oshi no Ko is not an intellectually challenging piece of art. That's why I miss Act Age, so much!- I digress.
Just because you "understand" someone does not mean you have to sympathize with them. You can understand why angry a German guy went rogue on some people, but it does not mean you sympathize with them. You can understand why a girl slapped a corpse, but given your values, you don't have to sympathize with them.
It is a void question because the answer is obvious. You are not even genuine with wanting to understand others. Because right after asking that question of yours, you straight us went over saying "people don't get that was to show how much his death affected her and how close they were" as if readers are illiterate or have EQ so low they can't read facial expressions.
People see it the way they WANT to see it. You want to see if from Kana's perspective, others want to see it from THEIR own perspective. If you find corpse slapping strongly offensive in your core values, you might as well as hate corpse slappers.
Kana did something controversial and she is getting the controversies her actions deserve. In my lifetime, to all the funerals I went or were acquainted with the guests, everyone was very solemn. Corpse slapping happening all the time would be wild, but still, never close to acceptable. If in your culture corpse slapping is the norm, okay. If in others it is not norm and very taboo, you get what they give. This is very basic.

Wow as if you are not doing the same by thinking everyone understands OnK like you say, yeah is not a difficult piece but of you look a little you'll find there is a bunch of people that need an explanation of whats happening, a lot of videos, and topics on social media because I've seen a bunch genuinely not understanding whats going on, and thats okay??? If you and I are used to this kind of manga then good, but a lot of people is not.
Also different cultures I guess, I've yet to go to a "solemn" funeral because there are always Kanas, and people going inside the hole crying their eyes out as wild as it sounds is my reality, maybe all the "drama" to me is normalized for the same reason.

Idk what to say, If Kana is such a bad charactwr for you like that the ok, nothing is going to change.
I like Kana, her design, personality and story, and the mangakas love her too, you can see from Aka's other works that he likes this kind of loud/complicated girls, so i'm fine with his decision of Kana being the main heroine.
In my case I dpn't lime Akane "that much" but I mostly ignore her, for the same reason.

I said that "people are not stupid, MOST of them". You wanting to believe that it implies "everyone" reflects your comprehension, not my intentions. And I highly doubt people wouldn't understand "THAT" given the overwhelming amount of exposure.
Understanding and sympathizing should not be conflated.
Did someone asked you for explanation? Did someone told you they don't understand why Kana behaved the way she did? Why would they ever need to? Her intentions were exposed in the same chapter as we speak. If she tells us (pretty much) "I slap you because I am sad and promised it", people don't need you to tell them "yes, she slapped him because she is sad and promised it". WOW! You thought you did something here? Near verbatim, at best.
You know for who this information has plus value? People who have yet read the chapter and have 0 idea of what happened there. This needless explanation of yours has 0 plus value for those who have already globed the last chapters.
For the third time again, it's not a lack of understanding that leads people to be displeased by her behavior. She EXPOSED her thought process. Assuming people wouldn't understand a character who literally and EXPLICITLY expresses why they behave as they do and might need your paraphrasing is baffling.
We see her slap a corpse. She has her reasons. We know her motives. We got them, they ain't convoluted. Yet, some individuals don't give a damn of those reasons because corpse slapping does not resonate with them. Some feel more sympathy toward dead people at their own funeral than "a friend" having a meltdown.
Deontologists believe that certain actions, like murder, are morally impermissible under any circumstances. Some moral individuals might as well class "corpse slapping" as inherently wrong, regardless of the context or consequences in the same way. It is not moral, it is not virtuous, it can be culturally and religiously offending, it can have legal repercussions (if someone is willing to press charges given the judiciary system) and as well cause distress to the other attendees (like the Mother).
At the end of the day, this "uproar", if I may say, has little to do with understanding Kana but a lot to do with accepting and tolerating the act of dishonoring the dead.
Defending Kana is like partisan rhetoric anyway... but whatsoever.

I don't think kana is a bad character, because she is(though she has some good moments). You just state what you like about her on the surface you never actually even go deep on what you actually like about her. Aka might make other characters with the same personality but that doesn't mean it will be the same situation, just because you have the same personality doesn't mean you are in the same situation and doesn't mean you have the same mentality or intentions(there are some tsunderes that i like but they have a right towards the person they are tsundere for). I see that you think of her as the main heroine but without her feelings being answered we will never actually know. You didn't need to bring akane when you don't bring anything that supports your opinion about her but just gloss over as if stating something.

I'm not even talking about Kana anymore, I meant what I said when I mentioned people don't understand OnK, not just simpathizing but full understand the story, like someone once made a full thesis about OnK being about Aqua and Ruby love story, and how important it was for them to end up together, but to be fair, those are probably just trolls, or people who only watched like the first episode, I want to believe people that make those analysis and videos are just trying to be funny, because is obvious they don't even read the manga, thats what I meant, theres a lot of people in the comments who are more or less the same, but at this point I think mostvof us understand whats going on.
Thats what I mean that theres a few people that are completely at lost, the other topic about Corpse slappers like you call it I don't really care anymore.
You are just nitpicking at this point ofc I don't mean literally anyone but ok, I have to be more careful with what I write because it ends up with someone else making a big deal of it.
People are hating on Kana for that? Bruh obviously people don't get that was to show how much his death affected her and how close they were. Is like making a promise to your closest friend, lover or whatever, maybe as a joke, but he goes and actually dies, she is obviously sad and mad, if she didn't show emotion at all that would be worst.
Everytime I went to a funeral the people closest to them always made a "show" is uncomfortable for the other people there, but absolutely real.