I'm not sure what purpose it serves to identify other people as "hipsters"; except perhaps to allow "serious photographers" to identify themselves as "serious" in contradistinction to those silly bearded tattooed dilettantes ... it all, sadly, feeds the tendency for derision and contempt of "the others" (those that aren't "us")
it's just taking photographs. we don't need to be tribal about it
You are right on the money, there. Its this perpetual desire to categorize and "other-ize" people that drive this.
I put this banner on my Facebook page a while back.