The great thing about hipsters is that they don't stand for anything and simply recycle previous era's aesthetics, which makes Real Countercultural Types hilariously self-righteous and super-angry over some ritualistic "lifestyle" trappings ("dude I had to order tapes out of 'zines and made my own MDC shirt, you didn't LIVE THE LIFE, poser"). But it does a good job in skipping the whole getting co-opted/selling out your principles stage, since it's already a co-optation without principles to sell out aside from maybe "old stuff is weird" and "deliberate tackiness is hilarious". Its disillusionment and casual rejection of norms is built-in, which just confuses the hell out of people because it's to hedonistic ends instead of your traditional rebellious or destructive ones. And since the only people who're really bothered by hipsters seem to be the type of people who are already overly concerned with their own sense/lack of cool, the very existence of hipsters is like some sort of elaborate troll to draw out and infuriate people who are way too concerned with trying to forge their own half-baked bohemian philosophy. Like John Lydon wouldn't be wearing skinny jeans and a dirt 'stache and living in Portland if he was born in Iowa 20 years ago.
(This is maybe overstating things a bit but frankly I am kind of tired of people thinking I'm some vapid rich kid because I listen to LCD Soundsystem and have a beard.)
(Hipsters that laugh at your sunglasses are pretty much legit assholes, though)