Hipsters are people that claim they are anti-mainstream, but really they're extremely mainstream. They are a breed of annoying hounds who want to be cool, wear dreadlocks because they are "non-conformist", beg for change on the street just for the extra cash, and everyone hates them.
So, all in all, they're douchebag, pitch-fork worshiping, arrogant, self-admiring, idiots