Things that I had only told him became public knowledge and onto public mockery, he was so nasty and full of venom. And even though I knew just as many things about him that I could have used to insult him equally I just couldn't bring myself to cross that line. I couldn't say anything to him that would linger in the hurt it can cause (sad thing is it probably would have bounced off his thick skin if I had said it all, whereas of course everything he said to me really did hurt my feelings).
IRL I would have lashed out, to me physical pain doesn't hurt as much as emotional pain, so I find it easier to smack someone who is hurting my feelings than trying to hurt their feelings too. It's silly I know because violence also hurts, but I grew up in a violent household so physical pain doesn't hold the same ability to hurt me.
I would rather fight you than rip into your soul with words no amount of saying sorry can change.