Customers want to think they're always right, but cashiers and retail workers know the truth. A lot of the time, the customer is just wrong. And nobody wants to be confronted with the fact that they've just thrown a petty fit over a minor issue , only to be proven totally wrong. Throwing a tantrum rarely solves your problems if you're older than five years old. When adults do it, it's majorly embarrassing. It gives us second-hand cringe to watch people get red in the face over minor issues, lik…