It is 2024, if you are an American and don't know how to properly tip, then shame on you. 20% is the minimum. Period. Nobody cares if you had to send your plate back multiple times, that service industry employee is working to pay their rent. The least you can do is give them $5. Like, stop being so entitled. This entitled customer got a beautiful act of petty revenge thrust upon him, and he probably never even realized it. You see, this guy was not only not going to tip, but he was also holdin…