Yeah, black metal people will flip their shit if you admit to liking anything other than black metal. Especially power metal, and especially especially any kind of rock, pop, country, electronica, or... well, anything not black, death, or I guess sometimes thrash metal.
I vaguely recall reading that one of my favorite one-man black metal acts, Xasthur, (Xasthur being the name of the band, its sole member calling himself "Malefic") was originally conceived as a full band, and at one point Malefic kicked a member out of the band when he learned that the guy in question was involved in... I can't remember, being a DJ or composing electronica on the weekends. NO POSERS ALLOWED
EDIT: In fact a few years ago Malefic decided everyone involved in modern black metal was a poser and stopped making black metal, or something. I dunno, guy is nuts.
EDIT 2: This is made into an ouroboros of irony, because Malefic is American and many European black metal fans think any American black metal musicians are automatically posers. I don't even know about misogyny in black metal since I've not been active in any broader black metal community, but I'm quite certain it is ubiquitous and pernicious.