The issue is trying to use genres as specifically as possible instead of being a broad category that covers a wide range of music.
Metal is the worst for this. The vast, vast majority of people would call everything from Black Sabbath to Metallica to Pantera to Death to Behemoth “metal”, but the genre snobs need to differentiate it all for some reason.
Yet, we’re perfectly okay to call everything from Blue Oyster Cult to Fleetwood Mac to Nickleback “rock”.