Tip 0 and see what kind of service you get the next time.
I used to work food delivery and naturally the customers ordering takeout at fancy restaurants would always tip 0 to the restaurant even if they tipped me for delivery.
I quickly found myself ignored by all the workers at those restaurants, orders take an hour extra to fill, no one talk to me, etc. eventually I learned to tip out of my own tip because my next service is contingent on the prior tip.
I live in an affluent area and my daughter works in food service. She says the people she knows to be wealthy are generally the worst tippers (often 0%). I have stuck with 15% even though that is below the suggestions on receipts these days and she tells me that's high for the restaurant's average.
I used to work food delivery and naturally the customers ordering takeout at fancy restaurants would always tip 0 to the restaurant even if they tipped me for delivery.
I quickly found myself ignored by all the workers at those restaurants, orders take an hour extra to fill, no one talk to me, etc. eventually I learned to tip out of my own tip because my next service is contingent on the prior tip.