So my roommate works at Buffalo Wild Wings as a waiter. On Tuesday nights, they have a really cheap wing night, I think they're 25 cents or something like that. He absolutely hates going into work on Tuesdays, because he says that there are a lot more black people who show up than normal, and they don't tip hardly anything. He said everyone else tips normally that day as well.
Is it racist for him to say that "black people don't tip well" based on his experiences and observations from working at that restaurant?