Except that Black culture is not a term that corresponds to all people of African descent. Black culture arose because of racism in the United States and it is not very accurate, as it refers to African American culture. People from the Caribbean, Latin America or African nations do not constitute "black culture." Unless your point is that white culture refers to White American culture, that is a culture wholly based on system of racism and subjugation. Had racism not been the flavor of the century for hundreds of years, there would be no black culture (owing its descriptor to slavery and segregation).
What are Yellows?
Mexico is a diverse country, it is not just a country of "brown people." There are people of African, European, indigenous American ancestry in Mexico. Louis CK is of Mexican descent. Do white Mexicans constitute white culture?
It's a simple question, is White now an ethnicity?