bongomania
Commercial User
You're basically asking "why do racial stereotypes persist?" Lots of possible answers, you could probably come up with a bunch of them yourself.
+1
Honestly now, to whomever was demanding links and references, it's a known stereotype. I'm not saying it's right, valid, or worthy of study. But it's enough of a commonly-held stereotype that it's ridiculous to act like it doesn't exist as such.
Thinking of it this way- funk, R'n'B, and reggae are the genres that pop to the top of my head first when I think "what genres feature the bass guitar most prominently?" Those genres are strongly associated with black culture, even though absolutely anyone can play them and even become famous for them. Heck, look at Pino- he's as white as they come yet he's revered for his funky R'n'B bass. But that doesn't separate the genre overall from its strongest cultural associations.
All I'm saying is, it's a reasonable thing to observe as a stereotype, if nothing more than a stereotype.

:scowl: