I want to insult somebody back
Why would you want to insult somebody back?
I'm pissed that he insults me.
Even if he insulted you, you shouldn't insult him back. It will probably just cause things to escalate.
You don't need to be so nice if you don't want to be. You are the nice one. I do not want to be the nice one.
If you go about insulting people back that could be a never ending crusade. You should learn how to let some things go.