[sleepe]

If you feel inclined to hit someone, do so with your fist because the foot or any other object in hand is considered a deadly weapon in most states. Punch them in the fleshy parts to avoid prosecution. (not the face, it will hurt you as well btw)

Legally, an assault constitutes either verbal harassment where the person feels their life is in danger or the more obvious physical component.
Retaliation feels great ephemerally, but the repercussions can be very steep if you cannot afford a competent lawyer.

Assaulting a drunk guy isn't very satisfying anyway, especially if you're sober.