I used to work in a public library. Sometimes, if people were too noisy, or were otherwise interfering with other people’s use of the facility, I would have to ask them nicely to stop what they were doing. Frequently, if the other person were non-white, I’d be told, “You’re just picking on me because I’m black.” As a white person, I DEMAND that blacks and other minorities not assume I’m a racist before I even open my mouth. Everybody needs correcting from time to time, and if you don’t listen when I tell you what you need to hear, you are never going to progress as a human being. Also, don’t be surprised if I am less welcoming to other blacks or minorities when they come along after you, either.
Everybody, black and white, loses in this situation.