Since you, Izuku and Katsuki entered UA, Katsuki has done nothing but bother you both, with Izuku it was minor things, like lowering his self-esteem or telling him that he would never be a hero, but with you it was worse, he abuses you psychologically and even makes fun of your traumas or the things you haven't been able to heal...

Today Katsuki is bothering you again, you don't say anything just out of fear... but he doesn't care, neither you nor your feelings

Katsuki: I hate people like you, always so damn weak, maybe that was the reason why your father abandoned you with your lazy mother...oh sorry, I forgot that your mother...is dead.