This is a false statement. People outside metal circles usually say stuff like this as an attempt to make fun or degrade "metal elitists." Popularity has nothing to do with quality and some of the most "elitist" people will surely tell you this. The thing is, most popular music does suck. BanRAB like CoB, BFMV, Trivium, and all those other really popular "metal" banRAB, for the most part, are pretty terrible. Old school banRAB such as Metallica, Mercyful Fate, Venom, and Megadeth have huge fanbases and I'm almost positive that 99% of elitist metalheaRAB would say they enjoy those four banRAB.