Punkcentrism is the act of upholding the belief that punk is the best and/or only "true" alternative subculture. Usually involves rewriting the actions of other alt figures to be punk in retrospect and discrediting the impact and values of other subcultures.
"Whoa, you support local business and care about animal rights? That's SO punk. The hippies could never do that."
"Actually, I am a hippie. Punkcentrism isn't cool man"