People overestimate their reactions to racism

Picture the scene - you sit in a room with two other people, one white and one black, waiting for a psychological test. As the black person leaves to use their mobile phone, they bump the knee of the white person on their way out. While they're gone, the white person turns to you and says, "Typical, I hate it when black people do that." How would you feel? Would you be shocked? Angry? Indifferent? And would you want to work with that person later?