In my own defense, I do tip when I feel a substantial service is rendered. And when it is not expected/demanded. I tip Uber drivers because I think they are underpaid and the company is sleazy for not building a tipping function into their app. I tip something in foreign countries at a meal even when a service charge is added if I have some small money in my pocket and get good service. I tip housekeeping because I know they work hard. I get annoyed and do not tip when people ask for them (it does happen in many places). e.g., was is Thailand recently seeing an elephant show and the handlers (who have questionable treatment of the animals) expected a tip for allowing us to take a picture, which I gave, and then asked for a second one because we had a child and also took a picture with him. I had no problem walking away from that, or from the doorman in hotel in India who asked for "a present" for opening the door for my wife, etc. Tips should never be expected or demanded or built into someone's salary.