CASE 1: Izuku Midoriya
We all know Izuku's backstory, so it makes sense why he would be the first character to be analyzed for this topic.
This quote was one of his very first sentences at the start of My Hero Academia. I've seen a few people call him a bit racist for that, but when you look at the story and the world of My Hero Academia, it would actually make sense that he thinks that.
On the very first few volumes alone, we can already see the issue of prejudice being rampant.
Deku is the only quirkless kid in his class, and everyone viewed him as a freak because obviously, only a few people were born without a quirk. He is kind and sweet and he would never wish harm upon anyone, but his classmates don't see that.
Someone once mentioned (not saying their name) that Deku should've stayed quirkless and just accepted himself, but would you accept yourself if everyone else you know hates you because of who you are? Would you accept yourself if you wanted to help people, but because you don't have something everyone else has, you can't do that? Be honest. Although... an alternate universe where Deku became the first ever quirkless hero would be cool.
It was mentioned that quirk usage isn't allowed in the school and obviously bullying wouldn't be allowed either. But as the class laughed at Deku and as Bakugou used his quirk to scare him, the teacher didn't even do anything. I'm not saying the teacher was prejudiced as well because this happens most of the time at school. But let me give you another scene where prejudice was really obvious.
After Izuku Midoriya attempted to save Bakugou, he was reprimanded by the heroes while Bakugou was given all the praise. Now, I don't blame the heroes for looking out for the poor kid who couldn't do anything to defend himself. But I never saw anyone mention that it was brave of him to at least try to save his friend. It would honestly sound a bit like a Dhar Mann video (now that I think of it, maybe MHA is just one big Dhar Mann video. I could already see the title: "Boy with a strong quirk bullies quirkless kid, instantly regrets it. Or maybe "Old man tells quirkless kid he can't reach his dream, instantly regrets it.") but if I were them, I would've given him at least just a bit of praise for trying to help him.