Consumer-facing businesses are always subject to a sour customer. This is the person who rages at the staff and is unhappy no matter what one does — like this. The workers’ attempts to mollify the person go for naught. The best one can hope is the customer leaves quickly before upsetting the rest of the people in the store. McDonald’s did the right thing by upholding its staff and calling for respect in economic transactions. That doesn’t mean it will be the case, but at least workers on the line know the company stands behind them. It is good internal relations and too often forgotten. Companies should remind employees that sometimes it happens and it isn’t their fault. There are angry people in the world and nothing assuages their ire.