The Music Establishment wasn’t even white vs. black or young vs. old, it was ASCAP (anti-rock, anti-hillbilly, anti-r&b) vs. BMI (which would publish such recordings).
Supposedly some of the resentment dates back to a musician union strike of the 1940s when artists weren’t supposed to be making new recordings.
Unions made Big Band music too expensive and difficult, leading to small-combo Bebop in jazz, and probably to small-combo rock-n-roll.