Ну это по-разному. Например вот. Здесь выпустили, но официантка погналась за гостями и потребовала свои чаевые: "On a personal note, I accidentally failed to tip a waitress once. My friend and I were splitting the bill and we had each misunderstood that the other person would cover tip. To be honest, service had not been great that evening, but of course we still meant to tip at least 15%. The waitress chased us down as we were leaving and demanded to know why she didn’t get a tip. She was very angry and the conversation was incredibly uncomfortable. We ended up tipping more than we originally intended and it definitely made our evening worse."https://www.quora.com/What-happens-if-you-don%E2%80%99t-tip-your-waiter-in-the-U-S