Typically many MTBers and BMXers are "hipster" but many of them picked up riding due to it being cool. You can generally see them riding down the street with 1+in spools in their ears, a can of crappy beer in their hand, and on some neon colored fixie, while having a murse slung around their shoulder and chick jeans on, with a crappy garbage mans style folded beanie, and a thrift store zippered hoodie on... even when it's 100f outside =] They are normally accompanied by women who look and dress worse than the hookers in downtown San Francisco.
(now on a serious note, there are some absolutely gnar kill pro fixie hipsters who absolutely shred in the SF bay area. So I def ain't knockin' on some of the hipsters talents. I just have no idea how people can wear chick pants and shred. I mean, I know with some effort you can shove your balls back in the hole they were in before they dropped... but man...lol)