because he is physically abusive person; the latest thing he did in the bath, also previous chapters I don't remember which one but after jiri's hand has been hurt, Yuri again bullied him physically. I am ok that he can be an ass with words but his behavior and his way of acting to the teacher are very violent. Moreover, there is no single logic reason behind this attitude of his
no he just needs to shut the fuck up and take a seat most of the time lmao. i don't care if hes shit at comforting others or has a sister complex, please for gods sake someone slap some flex tape over his mouth and get him a chair. this entire plot is moving so slowly despite it being chapter 43 already because this son of a bitch keeps bullying our beloved jiri but still "taking care" of him like some tsundere uwu fucker.
Coming back from reread, I still don't get the huge hate on Yuri. He has foul mouth but he's not acting the way he talks. Reflecting later and so on. Everyone other than jiri and yuri talks a lot. But those two hardly communicate, and when they do both are on edge. So it's really hard to pick out what they're actually thinking. Last chapter has been the most inner talk of yuri. They seem also get along well. Just bickering rudely.