This is not true, if the person doing the interview is also black. Or are you saying a black interviewer would also be racist against another black person in a suit and a tie? The fact is that race is matter of in-group, out-group thinking, and mentioning it exacerbates the problem because we are persisting the group-think. It's true the problem won't go away if we ignore it, but we should identify behavior and hunt down people who are racist, regardless of their race, and without mentioning their race so as to not keep persisting the grouping problem.