Why do hipsters always deny their hipsterdom?

I don't get this one, it's as if admitting to being a hipster is some dirty little secret nobody's allowed to talk about. At least not when referring to oneself, as hipsters will always call out another hipster while vehemently denying their own status.

I wonder if it's similar to calling oneself humble, you're only one if someone else says it. If so, then is coming out of their (Urban Outfitters/sweet thrifted finds-stocked) closets considered trying too hard? Does it clash with their nonchalant attitudes? Does it automatically make you NOT a hipster?

Some questions may never be answered.