He's allowed insults and to feel anger and hate, Yuta raped him
Oh please. He slut shamed him before that even happened. As Yuta says, he looks down on people as if he wasn't nothing more than a miserable pathetic man who yearns for someone who will never reciprocate. Funny thing is that you can bet that even when Seunghyun gets the casino the old man won't be back and won't care less, making him realize how pathetic he was for doing things he never wanted to get a little bit of attention from the old man. (And hopefully realize too that doosik isn't at fault for that, that old man would have NEVER been his and no one's at fault for that as he wants to believe)
I just love how yuta gets back at seunghyun everytime that trash whore-shames him. I can't fucking wait for him to be all tears for yuta and beg for his love. I can't stand how he belittles yuta at every chance, so he better be prepared to swallow all those insults.