hipsters are a collective entity which behaves not unlike locusts, infesting towns and cities with pre-existing culture or at least fertile soil. they multiply quickly and soon begin throwing coked-out* dance parties with laptop "dj's" playing generic upbeat music that hipsters aren't allowed to admit liking for more than a week.
their weekly theme parties are an attempt to substitute substance for spontaneity. they fail in spontaneity because it doesn't matter what costumes they are wearing or which genre of music they are pretending to like/not like, its all the same bullshit.
*cocaine is a drug that helps substitute a lack of self-confidence for what can be perceived as personality, depending on if the perceiver is also on blow. makes sense that it is the fuel that drives this nonsense.