I’m from a country where you can tip if you feel like it, I’m living in a country where you don’t tip, because employees are paid.
But when I was in the US, I understood how hard can it be to feel ok while not overpaying (because tipping is overpaying in many cases). I went to a concert, and there was a lady managing the automated wardrobe system. Leaving a jacket was $5, and on top of that you were offered to leave 10-20-40% tips. For what?
I entered “0”, the lady was looking at that, and she told me “THANK YOU, SIR!” in a very passive-agressive manner, so I felt like shit. But really, all I wanted is to hang my coat.