Do you live near a University Campus? A lot of universities are starting now and the College Freshmen tend to be a little dense. Their only experience with women is watching porno.
Drunk guys brain shuts down and everything else takes over. It's a common occurence. Shotgun blasts to the head usuallly help to bring them out of their stupor. Night sticks help too.
I'm sorry that had to happen to you too! something like that happened to me when i was at a gas station. Sum guy came was standin behind me and tried to put his arms around me and i pushed him away and moved and he tried to rub his nasty croctch on my butt?! i mean who does that ya know?!