Yup. They took the food to go. No sense paying a tip if you’re not eating there. Guy got a call and couldn’t wait for the food, so there was no food served. The waitress is the real racist, adding the slur on the receipt to get sympathy (and dollars).
There should be a special crime for this sort of nonsense. Turning peoples lives upside down and allowing them to get death threats for something they didn’t do (a word no less!) is truly evil.