OK, I'm a little drunk and already realize that this will probably not be a well received post. I'm sure some of you have already closed this thread, but hear me out.
Nu-metal drew heavy inspiration from hip hop, which I remember many back in the day naming as one of the reasons for hating it. Sure, there are so many terrible white boy rappers in the genre, but as we know many nerds have a burning hatred of rap to this day, and it's almost certainly at least partially thinly veiled racism.
A band having a DJ was definitely singled out as a reason to dismiss them, and since DJs grew out of the hip hop scene, it reeks of 
to me.
You could also argue that it's just narrow minded rock and metal enjoyers dismissing anything outside of their genre, but I definitely don't remember them having nearly as much of a problem with industrial bands like NIN, Ministry, Godflesh etc. using samples, drum machines and electronic music elements. It sure seems like hip hop influences were far less tolerated 
Am I onto something or is this just weird overthinking that randomly came to my mind?
Nu-metal also specifically branded itself as lower class/trashy. Maybe that was due to it's proximity to hip-hop, but it leaned into the immature "your mom won't like you listening to this" aesthetic. I associate it with dumbfuck dirt bike/lifted truck bros. The kinda guy who starts a fight cuz he thinks you looked at him the wrong way
This was definitely 1999-2001 when Limp Bizkit was big, then Hybrid Theory got massive and every bottom feeder nu-metal band suddenly became real introspective, lmao