But servers say they have their own long list of grievances - and they don’t favor stingy diners. According to FinanceBuzz, which surveyed service workers about the tipping habits they find rudest, several once-normal practices are now considered unacceptable. In 2026, servers say that tipping on the pre-tax amount when dining out is rude. A pet peeve for baristas is when customers skip the tip on coffee orders. Even though customers typically walk to the counter to order and collect their drinks, servers say they still expect a gratuity.