I think in general its the fans that dictate the taxonomy since all artists *just* play music. We classify as an organization tool for discussion and to find other groups/cliches to associate with.
All I am saying is that if you were in a crowd of heavy metal fans, I seriously doubt Limp Bizkit would be an appropriate topic.
In fact, I'm so sure about it, the next heavy metal show that does not include Limp Bizkit, please in between sets, scream "I love Limp Bizkit." Wait, and see the reaction. Feel free to scream it out as much as you can so a good sample of headbangers hears you.
Please report back.
Try the same thing, but instead of "I love Limp Bizkit" scream, "Slayer!" Again, wait and see the reaction.
Please report back.
[DISCLAIMER: Screaming "I love Limp Bizkit" at a heavy metal show may cause serious injury or death. Say at your own risk.]