Cult

Cult (adj):
1. Particular to a specific Culture. Cult music, cult movies, cult etc. Usually hard to find and liked only by a few
2. Something (music, media, movie, person, etc.) Liked only by a few people and disliked by everyone else. Specifically, you either like it or you hate it. there is no in-between.

1. "Oh, you haven't heard of the band Kick the Robot? Makes sense, they're pretty cult"
2. "Oh, you don't like Brad? That's okay. I like him a lot, but he's kinda a cult friend."