Maybe the dumping of the beer over he head was a little extreme, but you're definately not an asshole for doing it. Especially since a beer can be like $6-8 at some clubs.
Nice how the ugly girls feel they need to be the worlds police. They're the ones not getting crazy or having fun at these parties. So they go back to their little rooms and study hard to become lawyers and persons of importance, and enact rules to take away some of the fun they never had. I hope it doesn't come back to bite you or anyone else in the ass someday.
