For what it's worth, I've never discussed any of this with any college professors, I barely got through high school. I'd agree that there is a tendency for various portions of the 'under-classes' to be hostile towards each while also still basically being basted in the same cultural influences. Let's face it, keeping poor people at each other's throats is a good way to keep us distracted from systemic issues.
Generally speaking, English, Scottish and Irish influences on western contemporary popular music are massive, as are West African influences. It's hard to untangle where those influence were introduced because we're already two or three dozen generations past when the mixing occurred and even the genres that tend to get claimed by one group or another are influenced by the whole range of influences. In the 90s media talked a lot about 'rap rock' for example but missed that groups like Onyx and Cypress Hill were like the mirror image of that, they had the aggression of hard rock even if they didn't sound like hard rock.
Basically, the segregationist mindset led to white artists performing music similar to what black artists performed being viewed as separate, and same in reverse so that all of these genres which would spring up that were just 'how those folks play these folks music'. Rockabilly was literally just rock 'n' roll performed by hillbillies, as an example.
I have a big appreciation for 'vernacular culture', whether it's music, dialects, whatever. My attitude towards people who speak with vernacular dialects shifted all at once, so whether it's Newfies or Cockneys, or folks with hillbilly accents or rural southern accents or AAVE accents, I started to appreciate them all around the same era (14-15 or so). Starting to appreciate non-standard dialects played a huge role in getting hip-hop, let's face it, it's hard to follow if you're not familiar with the slang, jargon and the whole rest of the lexicon.