The experience of black women is different than white women in America. For black women America is a hostile place due to ingrained racism. I have travelled to almost every region of the U.S. and have yet to find a black woman that sees herself as having a comparable experience to white women at her same educational and economic level.
If the average person in America thinks that most black men play basketball and like rap, then it is not an unlikely assumption that the average doctor thinks the same. The media has played into these stereotypes. In everyday life, most people in the U.S. tend not to have many friends outside their racial groups, leading to more misinformation.