There was a longer story linked from MSNBC that explained that the lady had one of her white employees wait on customers one day and they made 150 pounds, but on the days that the proprietor waits on customers, she gets around 30 pounds. So she suspects it’s because of her race and not the food.
Fat ugly waitresses don’t make as much as attractive trim waitresses. Rude waiters don’t make as much as nice waiters.
Some people are quite unpleasant and make you feel as if they are doing you a huge favor by taking your money. Those people don’t do well in people-person roles.
Individuals differ in a myriad of different ways, race being just one. That she can fathom only one reason speaks volumes.
Maybe she doesn’t understand that their no tipping policy goes both ways.