I had a room-mate in London who held various jobs throughout his stay there, and he had many colleagues. He told me that he used to work with a bunch of black guys and they frequently made tribal remarks on him for being white. Of course if he did the same thing he probably would have been fired or reprimanded for being tribal.
Another time, at the hospital he was working at, there was black mother with her daughter. The daughter had to wear an oxygen mask which the mother protested against heavily, shouting things like they only made her wear that mask because she was black and so on. Funny thing is, even the daughter was telling her mother to shut the forget up.