(Head's up for some language as well as potential spoilers at the 4:58 mark if you haven't caught up on the entirety of My Hero Academia yet.)
Really, you could take any show, book, game, whatever and apply what the creator of this video is saying to it. It's absolutely 100% true.
Ultimately, fans can engage with a medium however they'd like. But I agree it's pretty out there how people will project themselves onto certain characters or whatever and base their enjoyment of the medium on that one thing, then get angry the story doesn't go the way they wanted. And other such craziness.
One person in the comments believes that the video creator is trying to push a mindframe of toxic positivity, but I don't think so. Toxic positivity, according to Psychology Today, is described as "the act of avoiding, suppressing, or rejecting negative emotions or experiences. This may take the form of denying your own emotions or someone else denying your emotions, insisting on positive thinking instead."
I've personally had a few experiences with toxic positivity, including within fandoms setting. Back when I was still part of the Elena Of Avalor subreddit over on... well, Reddit, there was an episode of that show that I found pretty subpar, and said so in a discussion thread. Not in any way that was insulting to fans who enjoyed it, just that I didn't think it was a good episode when they'd done better ones in the past. I explained why I thought this. Well, this new guy jumped on my case because I was very critical towards Elena's character and saying the episode was excessively corny to the point of cringe. You could tell he was already on the defense and just getting madder and madder that I wasn't agreeing with him that his cartoon girlfriend was the coolest.
Afterwards, this guy would come after me not only whenever I had a negative opinion about EoA, but would also start baiting me by insulting stuff I like even when I wasn't being critical of EoA in an effort to get under my skin. And then the whole subreddit started turning into that. Now that's toxic positivity right there.
Nothing wrong with criticism. But if something I like starts turning into garbage and there's no signs of improvement, I jump ship. I'll fuss about it from time to time, but I don't keep watching/reading/etc because I feel like I'm having my time wasted (which is a massive pet peeve of mine's, especially these days), and I don't want to see something I originally enjoyed go down the drain. In the case of EOA, I just started writing fanfiction.
