I guess I've never noticed that. The other stuff you mention, I agree with.
When poor rural Southern whites use rural Southern dialect conservatives love itI guess I've never noticed that. The other stuff you mention, I agree with.
I read some neo-confederate boasting about how the "hillbilly" dialect of Appalachia represents the English of the Elizabethan period and the literary zenith of the language. I don't doubt it, either.
"Black" English doesn't come from Africa but from the British Isles (it conserves certain archaic British dialects). As one who grew up reading Uncle Remus and B. A. Botkin Southern folklore anthologies I must admit that (while I believe knowledge of Standard English should be taught to all) I have never considered the various venerable American dialects to be "leftwing" or in need of eradication.
Personally, I'm a big fan of Gullah.