I try to remember to capitalize both; but it’s true that ‘white’ people don’t exactly identify themselves with their skin color in the same way that ‘black’ people do. In conversation, White people would tend to say that we’re ‘Irish American’, ‘German American’ or some other descent, than to say we’re just ‘white’. So, the capitalized ‘Black’ has a somewhat different meaning within our culture now.
Anyhow, it’s way down on the list of things that bother me one way or another...
I was an English major. Neither should be capitalized.
Some Africans and Caribbeans don’t like being identified with U.S. back people.