re: What's behind racial differences in restaurant tipping?

When I was waiting tables during my college years we called a table with black people a BT short for black top. No servers wanted BTs it didn't matter if the server was black or white. I would say at least 80% of the time tips would be less than 10% of the tab. Pentecostals were just as bad at tipping. And yes if you aren't going to be a good tipper you won't get as good service. This was 20 years ago though so maybe it isn't as bad now.