Disparities are only proof of disparities. Just because Group X doesn't have the same as Group Y, doesn't mean that it's explained by racism. And why does this so called "White Supremacy" only run against one group of Black Americans? Why doesn't it run against Asian Americans, who out earn White Americans by over 60%? Why doesn't it apply to Jewish Americans? Or Indian Americans, all of whom earn more than... White Americans??
The concepts of "White Privilege" and "White Supremacy" are quite strange when the average Japanese, Chinese, Korean, Singaporean, Malaysian, Indian, Pakistani, and the Lebanese household out earns the average White household in America.