Most Helpful Girl
To defend yourself it is always okay to fight back but if you are hitting her just because you are pissed is not right nor is it right for her to do it to you.1
Most Helpful Guy
If a girl is trying to kill me or inflict serious injury upon me, it'd be silly of me to just sit back and take it. Hitting is justified in self defense. Part of being a gentleman is knowing when to take the hit and when to respond with defense. You just have to read the situation and deal with it accordingly.
Is it wrong to hit a girl for any other reason than self defense? Most definitely yes.1