Sometimes the topic is race, sometimes the topic is culture. There is no such thing as 'white' culture, but then again there is no such thing as 'black' culture either. Because there are many different cultures within each racial group.

If you don't care about matters of race, you don't need to talk about it. But when you're talking about racial stuff, there's absolutely nothing wrong with saying 'white' or 'black'. There's lots of people who do want to talk about the area in between 'everyone' and 'muh specific culture'.