My understanding of this convention: white is a color, not a recognized culture. A color does not require capitalization. A culture would require capitalization but there is no “White Culture.”
At one level this makes sense. People that are white are very diverse; too diverse to be described as one monolithic culture. People that are white are liberal and moderate and conservative. People that are white are in several economic classes: upper class and middle class and lower class. They are Democrat, Republican, Independents, etc. They are easterners, southerners, westerners, even mid-westerners.
This is different - I'm talking liberal orthodoxy now - from members of the Black Culture. They are not diverse. They are monolithic. One hundred percent of them are claimed by the Democrat party although in actual practice the number is less than 95 percent. People in Black Culture all come from similar backgrounds, all have the same experience, and all of them are buying the best products available I've learned from watching commercials. And they all think alike.
There are known exceptions: some few black people are not part of the Black Culture. Clarence Thomas comes to mind. His exclusion is due to liberal belief that he is a race-traitor. He and his ilk are hardly worth mentioning except in a context that diminishes them.
The Black Culture is a separate culture. And in the future it will be more so as soon as we can find a way - in addition to capitalization - to emphasize the distinction.
Perhaps soon we can recognize Black Culture by the wealth it generates from rigidly-enforced reparations.
Won't that be grand?
But wait a minute blacks often say don’t be acting white so how does that fit in with our diverse non culture?