[Aargh! Mustn't hit Enter in From: box, or it posts an empty message!]
I imagine that the line in Dick Darby the Cobbler:
My wife, she's the Devil, she's black
is nowadays taken to refer to a historically-disadvantage minority group :-) instead of to the black (-haired) Irish ...
[How do I know that this really refers to hair color? Well, I don't for certain, but it seems a close analog of expressions like "The Yellow Tinker" (a tune title), which I don't think refers to tinkers of Eastern Ancestry, because of phrases like "the yellow- headed tinkers with their wares" in Tommy Makem's "Rambles of Spring". Of course both the words "tinker" and "oriental" (my original choice to describe the tinkers' non-ancestry) are themselves considered politically incorrect.]