It didn't help that the first NASCAR driver of the melanin-enhanced variety was named Willy T Ribs, you gotta admit.
Personally, I think it is stupid of the teams not to load up with minority drivers, black, brown, yellow and female. NASCAR fans are extremely loyal to their brands, and there is no lack of brands that could sponsor them. To blame it on NASCAR itself is kind of silly, though, since all they can do is say "no" to sponsors they find objectionable.