Honestly, everyone of these guys are kinda of horrible people, i have no sympathy for them, it's kinda similar to that another manga about the bullied students, I also noticed that bullying and people acting like shit to others is a big problem in Japan
https://www.nippon.com/en/japan-data/h00855/
https://japantoday.com/category/features/kuchikomi/the-hell-of-adult-bullying
https://www.quora.com/Why-is-bullying-in-Japan-and-Korea-so-mean-and-terrible
Honestly if it was not so over the top, it would be totally believable
Hope these assholes got what is coming from them