Disliking stories

I don't get what's so wrong about criticizing, or even just giving an opinion about a manga if I don't like it, specially if it's popular, I normally only do it if I really don't like it, maybe because it could've been written better, or there are too many plotholes while the chapters are constantly just the characters fucking, which I don't mind if the majority of it it's porn, I eat that shit up, but when the story has actual story and plot, I also wanna know abt that too
Like, I don't like to criticize something without reading it first, ofc there's the exception when people pin point things like, the author is a pedophile, and is drawing straight up child pornography, or that they add romanticize rape and abuse for the sake of nothing, but to fill in the author's own fetish, go ahead w that, I normally agree and don't comment when that's what the manga is being criticized on, but when it's a manga that people seem to like, and I personally don't like some things abt it, I like to give my opinion, by first reading the whole thing, cs that seems fair, right?
I never insult the creator, nor the creator's work, or even the art if I personally don't like it, I genuinely give my opinion abt things that don't make sense, or again with the plotholes, or about the characters, and the way they act w their partner, and certain things abt them, and the way they react
You can disagree w my opinion all you want, that's totally fair, and valid, you can even dislike the comment, and give me your input and opinion about it, but to blalantly disregard someone's opinion on something just because you like the manga and I don't?????
Like, am I NOT allowed to give my opinion about it?
Am I like, not allowed to read something I don't seem to be liking and continue on reading it???? Like idk, maybe I think things will get better, or the plot thickens, and I wanna keep reading to give my HONEST opinion after reading it all
People tell me "oh if you don't like something, then don't read it, and read something you actually like"
But I liked it at first, so I wanted to read it all to, then again, give my OPINION, without even being rude or mean
Is it that bad to criticize something??? And again, I'm not even saying things like "guys, this thing sucks, and everyone that likes it suckas ass and they should die bc I'm right"
NOT AT ALL, you can like it and even call it peak, whatever, I don't care, but to call ME out, for giving, again, MY opinion on something you like, js because I don't like it?
And then have the guts to be rude to me, when I wasn't even being rude to anyone, not even the creator, nor the people that liked it
Like what, honestly?????