Punched a guy where it hurts, feel bad

Guy grabbed my chest when out at a club. I punched him 'down there', yelled at him and walked off. I guess that was probably a bit of an overreaction (mostly due to alcohol tbh) How should I have handled it? Normally I just give them a dirty look or shout at them before walking off.

Put the internet to work for you. via Personal Recipe 2629979