First off, it isn't racial, it's cultural.
Second, it's unclear is the origins of the term are self identified or imposed from the outside. It first appeared in print in The New Yorker, but the author states it was the term the locals used to describe themselves.
Finally, while it has some derogatory aspects [poor, illiterate] it's also embued with positive attributes [self sufficient, free, hardy].
The turkey twerked his tired tail
The cranberries comboed well with cooked kale
And sad Scotty Scott sadly sat, slowly singing 'Vicky Vale, Vicky Vale.'