you mean certain clientele that look like Obamas children and relatives.
My son waits tables. Almost without exception, blacks do NOT leave tips...or they leave an insulting tip of a couple of dollars on a $100 bill. And they work the servers to death. Even the black waiters have gone to the hostess and told her ‘NO MORE BLACKS IN MY SECTION.’ I don’t believe this so called pastor when she says she left money on the table.
When my son waited tables at Applebee’s, his comments about non-optimal tips from that group as being just the way they rolled and there was no connection he could discern to any other factor.