The rules of tipping have changed in recent years. What used to be considered adequate in the 15% to 18% range is no longer the norm. Twenty percent or more is standard now.
For your millionaire son to criticize you about the size of the tip you are leaving (while refusing to supplement it) is beyond rude. He's biting the hand that just fed him, and you and your wife should point it out.
Many of my friends' husbands and boyfriends have hit on me. Maybe it's because most people don't see my boyfriend and me out and about.
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