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At an airport once the coffee stand had a girl behind the counter that would just hand you an empty disposable cup. She didn’t even handle cash, it was card only using a self checkout POS system. And it still asked for a tip with the default of 20%.

There should be a way to specify a negative tip.

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If you really want to make a deal out of it, you hand it back to the server and ask them to select 0 for you. Mention that you don't think the service deserves a tip, and that you resent being asked.

If enough of us start doing this, it has a chance of applying some back pressure, although unfortunately that force acts through the poorly-paid checkout operator who doesn't directly have the option to influence decisions.

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