I agree that NO ONE has the RIGHT to lay hands on someone else, but if you do you better be prepared to get what's coming.
If I raised my hands to anyone, I would fully expect for them to come back at me, no matter their gender.
So if a girl smacks a guy she better be prepared to take a smack in the mouth back.
Ideally the person who got hit should just turn their back and never look back. But the reality is that rarely happens.