cik KIAH !

From what I understand, it is not okay for “real metal” fans to like any deathcore bands. For example, you are not allowed to be into both Deathspell Omega and Winds Of Plague, because WoP don’t have the right haircuts or clothes to be considered a “legit metal band.” It is also important to share your unsolicited, excessively strong opinions whenever deathcore bands come up, letting everybody know that you “are into real metal,” and that “deathcore is the worst shit ever.”
With that said, I’m confused about how there are a few deathcore bands that seem to get a pass from metal nerds: Darkest Hour, The Faceless, Between The Buried And Me, etc. The same people who get very, very angry about the popularity of bands like Suiside Silence or Miss May I love The Black Dahlia Murder, All Shall Perish, and The Red Chord, which is weird to me because they do not really sound any different.
Can anyone help me understand this??? Why are some deathcore bands considered “generic garbage for idiots who shop at Hot Topic” but other deathcore bands are “brilliant musicians who keep pushing the boundaries of the genre,” according to metal nerds???