Purist means bore from my experience.

Sad buggers who won't go in a pub unless they serve "real" ale, waffle on about a 1954 definition of an abstract form of entertainment and reckon the only words to Sir Patrick Spence that count are the ones they first heard, normally on their mother's knee (allegedly).

Would you care to put a name and a face to such a person?

People who get off on having entirely imaginary enemies are a pain in the arse.