McDonald's is a classic counter-cyclical stock. When money gets tight people eat less at fancy restaurants and more at McDonald's. So McDonald's does well when people are doing poorly, and vice versa.
Poor people in America are often just as time-poor as they are money-poor. Rice & beans takes time that you don't have when you're working multiple jobs.
You can claim that poor people shouldn't be eating McDonald's, but they fact is that they do. McDonald's is counter-cyclical.