by Thomas Brady

The various unkempt states of presenting oneself so that it looks as though you probably don’t have a job, and that is part of the look, because it makes you feel as though you’re filtering people that you do not want to deal with on a day-to-day basis. It’s a protectionist reaction. Yes. So if you have a problem with people that identify themselves as “hipsters,” well, it’s just a classification that likes to insulate itself so that it’s not infiltrated, even though they’re infiltrating themselves by making facsimiles and copies of themselves within their own population.

Reggie Watts, from My History Thus Far.

So that’s why. That explains the PBR predilection, too.