Ken makes a valid point, particularly in regard to music and musicians. We are all a product of our own times. Who knows what Bach, for example, might have made of African-American musicians in his drawing room? Looking at the evolution of values over time, who knows what practices of our own will seem reprehensible in a century or two?
Of course, it is easier to give a pass to musicians than to writers. Once we know the basis of their values and where those values have led the human race over time, it is hard not to see evidence of these ways of thinking in their written words and thus find them less appealing.
Still, the changes we have seen in racial matters makes us appreciate all the more those 1920s musicians who worked well together despite the color line--Teagarden and Armstrong, Condon and Waller, Lang and Lonnie, Bix and Bubber, and others who just shrugged and said, "Let's blow."