Wouldn't be surprised if the harsh vocals and usually undiscernible lyrics (even when they're available in writing somewhere) help them smuggle it in lyrically/concept-wise. Also the angriest music which pairs well with their shitty personalities and persecution complexes. A lot of elitism in it too because it's just off-putting enough to normies that they usually won't listen to it while not outre enough that dumbasses like chuds can fall into it.