I have the misfortune to work amongst many younger people, many of the nigger variety (it's the military, what can you do?). I see this at the gym also and sometimes out in public.
I do NOT see white people doing this, and I can only imagine it would be the nigger-worshiping whites that would do this anyway.
Dindus wearing headphones listening to their shitty music is one thing - I don't have to interact with them and I don't have to hear their coon tunes. So why do younger black males make a point to sing/rap/mumble along with their bullshit? It happens often enough that now I play dumb and pretend as if they are talking to me and they usually act a bit surprised as if they have no self or situational awareness (they don't).