Managers often bend over backward to make rude, entitled, and petty customers comfortable, and it makes the employee who originally denied the customer's request look pretty bad. Let's say you're a Karen, and you want to use an expired coupon. For the sake of our little experiment, let's say that this coupon has expired over a month ago. You're furious when the employee points out the obvious, because, well, you're a Karen, and demand to speak to the manager. Poof, the manager arrives and overr…