
How is Toga a hypocrite? She's pointing out a really important issue in the story.
Heroes go around saying they'll save everyone but this "everyone" is pretty limited. The society was built in a way that people think everything is black and white, heroes and villains, when it doesn't really work like that.
What makes Endeavor so different from, say, Twice? Both have done wrong things in the past but they fight for those they deem worthy. What's in between them? A hero license? That's it? Once you're titled a "hero", you're above the Law and you're put in a throne of higher morality. You essentially choose who lives and who dies.
Not to say Toga is morally correct — she really isn't —, but why couldn't this failed society save her from herself? Why didn't the heroes save Twice and Gentle and Spinner and Shigaraki and so many other people who were ignored by society and turned into villains?
"Oh but this X character was mistreated and didn't become evil."
That's the point here: are villains born evil? Why are there villains in the first place? Are all of them just blood-thirsty psychos? Is everyone behind bars an inherently bad person? Or is society the way it is built responsible for that? Is authority always right? Why are some lives more valued than others?
I don't have the absolute right answers for these questions (because they don't exist), but that's why we should be reflecting on those.
If all you got from what Toga said was "oh but she also killed people", you have some thinking to do.

Ok but how didn't ANYONE think it'd be a bad idea to send most heroes to one place and leave the majority of the citizens unprotected? I do understand the importance of this mission but they should've planned it better.

No, I'm pretty sure MOST of them are there. At least most heroes from that region. They figured out which hero was with the villains because he was the only one left behind in a certain city, for example. It was also implied a few times that civilians were confused that the cities were mostly empty (in terms of heroes) and I'm pretty sure Gigantomachia wouldn't have attacked, like, over ten cities without a single hero doing anything if hundreds or thousands of them were still in there. They even called heroes in training, not even experienced ones, just straight up first year students with newly acquired licenses, to fight against the League of Villains. They're in a pinch.

You can read Uraraka saying "Weren't nearly all the heroes assigned to this mission?" in one of the last panels of chapter 282. If you don't want to believe that most heroes are there, it's on you. If you think it doesn't make any sense, it just proves my point of it being badly planned. Anyway, have a good day, I won't reply anymore.
I love how people are either turned on by the sock garters/shoes combo, want them to remove the shoes and socks immediately or just have no idea how they removed their pants while keeping the shoes on.