Forget discriminating people based on their race, religion, gender, or colloquial term for four-square, it's all about playlistism. That's right, judging people by their iTunes playlist.
Playlistism, Aubrey explained, is discrimination based not on race, sex or religion, but on someone's terrible taste in music, as revealed by their iTunes music library.
This has lead [sic] to a new kind of music snobbery called playlistism. Music snobs amuse themselves by laughing at a colleague's collection of showtunes, or the hopelessly pretentious jazz of the goatee-ed guy at the other end of the dorm.
That survey was prompted by earlier, half-serious anecdotes from college campuses on the practice of "playlistism" – bias against people whose tastes as reflected in their digital music collections just don't measure up.
2010 — Leonard Sweet, Nudge: Awakening Each Other to the God Who's Already There, David C. Cook (2010), →ISBN, page 100:
This will help combat the music snobbery called "playlistism" and reduce playlist anxiety and playlisting pruning to suit the musical tastes of others.