SecondAttempt
Thinks s/he gets paid by the post
I once got a taxi in New Zealand at around 2:00 am. The bill was $18 and I handed over $20. As I walked away the driver called me back to give me my change. He looked confused by my behavior.
I am always somewhat surprised in most other countries when I hand a taxi driver even paper bills above what the fare is (usually because the coins are harder to count quickly) and start to hussle my way out and the driver tries to get my attention to give me change. Surprised not because tips are not customary. Surprised because I'm sure he knows tips are customary for taxis in the US so he could easily make a little extra and I might not know or care.
We had an Italian friend 25 years ago and he told us that in Italy it was offensive to waiters to offer a tip because they are fairly well paid and that makes them feel like they are being treated as servants. Of course tipping is still not necessarily the norm in Italy, we found a tip line fairly common on restarant bills in 2019.