Don't give a shit about anything and will do what they want. They are not insecure and don't care if something is childish, lame, weak, etc... they will do it. THEY DO WHAT THEY WANT! True hipsters are the trend setters of hipster culture and often followed by the wanna be hipsters(individuals who think its cool to be a hipster and cares too much if they're hipster enough)
friend: That beer is nasty, I wouldn't even bother touching it.
true hipster: Hmmmm, I like it! It taste good, give me some more PBR!
friend: Pabst Blue Ribbon taste like aluminum can man...
true hipster: it didn't get Blue Ribbon awards for no reason ;)