Mad about having to tip? You might have this

Tip rage is becoming a problem. Here's what to do if you have it.

If you’re upset about being asked for a gratuity at every turn — at convenience stores, supermarkets and even on websites — then you might have a case of tip rage.

“There are now more situations than there used to be in which we’re expected to tip,” says Gail Sahar, a psychology professor at Wheaton College in Norton, Mass. “That feels unfair to many peo…