It's a bias. Let's assume that all muggers wear red pants (or you have been mugged mostly by people in red pants). So when you see somebody in red pants you cross a street. It's surely not a textbook racism, since no race is involved. Also how do you know that anybody wearing red pants is a mugger? The tragedy of blacks is that they can't change skin color, unlike pants. This bias will exist until crime percentages will at least equalize between blacks and whites (do they?). You can call it a racism if you want but it doesn't change anything. I have worked with many blacks, I had zero problems with any of them, I don't consider them worse than me in any way, but I will cross that street. Sorry. There is a difference between a concrete person and statistics.