Korn IS a great band. Of course you won't hear that here since it's not kvlt to consider nu metal, metalcore, or deathcore to be music, let alone related to metal. Heavy metal fans most likely naturally prefer heavy metal to other heavy music such as nu metal and metalcore, hence making them heavy metal fans, but to accept the fact that other people who do enjoy nu metal, for example, are not just immature morons but people with tastes distinct from their own, would make them ostracized from the metal community for that tolerance of other opinions. This is how it works for a metal poser such as most people on any metal forum:
1 Heavy metal- must profess its superiority, especially "technical" forms of it, because how difficult it is to make something necessarily denotes quality
2 Other heavy music- must deny that it's heavy, and that it's music, and use immature vulgarities to describe it, either so that you stay popular among other metal posers or to reaffirm to yourself that you're not "mallcore", because its similarity to the tr00 heavy music you're supposed to like secretly makes you insecure. Must also constantly point out that influences from hardcore, hiphop, electronics, etc all make it illegitimate, despite the fact that all of those in turn evolved from 1960's rock, as did heavy metal itself
3 Light pop / soft rock music- must like it to show that your tastes are "diversified" but must also claim it is inferior to metal, especially if it is mainstream, because the number of people who like something is inversely proportional to its quality