Seriously, both memes exist in blues music as ridiculous as that is.
There are SOME exceptions to that... The best example being Johnny Winter (and you can't get much "whiter" than Johnny, or brother Edgar :-) ), who Muddy Waters referred to as "My son."
Check out the albums Johnny produced for Muddy Waters, in particular, "Hard Again," one of my favorite albums of all time.
Mark
Johnny being Southern and albino— from Brownsville, TX— he would NOT be whom I was talking about. He was also a musical genius.