I [heart] Irony
A few of the links that remain lead to sites nobody could vouch for after all these years, so they are marked and you click them at your own risk.
Any card carrying hipster loves them some irony. Unfortunately, carrying a card as proof of hipsterdom is not considered, well, hip. Many hipsters speak thru their wardrobe, which is an alright way of going about it.
One could wear a shirt with characters from The Land Before Time on it, but that's a bit too subtle [not to mention mildly fey]. You need to go the opposite direction and beat people over the head with what you're getting at. Like really really hard.
I [heart] Irony pretty much comes out and says what you want to. Sure it's extremely blatant - which is the antithesis of cool for a hipster - but it's so blatant that it somehow manages to shoot back into cool territory again. I'd illustrate with a bell curve, but I don't want the USA Today readers we picked up to get tugwax on their keyboard.
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