As someone who has worked a lot in customer service, I can assure you that I have never seen a coworker react badly to a customer yelling, ‘You just lost a customer!’. Because the honest truth is, we just didn't care. I can promise you it's quite universal, as anyone working a minimum wage job just isn't getting paid enough to care. One man entered a restaurant to have a nice meal with his wife. At first, all was going well. They got their food, ate it up, talked, whatever. Then he asked for th…