Hitting women - right or wrong?

If a girl spits in my face, I'd spit back, if she slaps me, I'd slap back, if she punches me, I'd punch back. I wouldn't punch or slap with all my force but try to with the same force she used on me but I'd be sure to teach her that it could be a lot worse. If she doesn't learn her lesson sooner and nicer, she's going to end up killed by someone else.