Got to say I agree with clubber on this one, while the cops reaction may not have been desireable if all the lippy little kids would learn to STFU and listen to the cops when they tell you to get lost, there would be alot less of this going on, seems like kids these days wanna provoke cops, and then play the innocent victim when they get push back, guess what if you keep jabbing someone with a stick eventually they fight back, a lesson that seems to be lost on kids these days.
I was at lots of house parties like this in college where it got out over the internet and all of a sudden a mob of a couple hundred people show up at the party, managed to not get my ass kicked once by the cops because once they showed up, i just bit my tongue and left, meanwhile the bigshots at the party who thought it was their duty to provoke the cops inevitably left in the back of the squad car, after getting beaten up. Its not rocket science.