Our department was having a meeting to discuss the merits of a job candidate (who is a person of color). Many faculty members were questioning whether the candidate really knew anything about the things he mentioned in passing during his job talk. These things were details of the relevant literature. This job candidate was a tenured philosophy professor at a major university, and the details of the relevant literature are not particularly difficult to grasp. They are covered in advanced undergraduate classes. I have never seen similar doubts raised for white tenured professors teaching at major universities. Nothing close to this. People just assume they know what they are talking about. Sadly, this is not just an anecdote. There is plenty of empirical literature to back this up.