Probably helps that I'm happy to listen to whatever genre

https://literature.cafe/post/28543493

It’s been a while for a new rebellious music genre to appear, though…

Kids, let’s go, we are waiting!

Mumble rap is the rebellious version of old school rap.

Just look how angry it makes old school rap lovers.

Might well be, rap seems to be a good candidate.
Although in Germany I would rather see immigrant-influenced Deutschrap here, maybe connected to the Talahon youth culture.
That would definitely fit the bill, as I certainly will never become a fan of any kind of macho ultra-conservatism.
I generally don’t really like rap, but mumble rap just sounds lazy as shit. Like “I can’t even be bothered to open my mouth”. It’s also so stupidly monotone. I may just be an old man yelling at kids, but that’s music I will never understand.