Capitalization is a minor but irritating game they play. Some years back I noticed that in books published prior to the 1960s either neither race was capitalized or it was Black and White out of respect. The leftists capitalize just Black where I am from so I have started capitalizing both (I seem to have forgotten in the above comment). It's a personal choice and I understand why you don't like to capitalize; a lack of a capital does make skin color into an attribute of ethnicity like "brown-eyed" or "fair-haired" rather than the main identifying feature

Best regards