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I'm just annoyed with people who say "Back home in my country, we don't tip. Therefore, why should I tip in while in the US? The Americans should do it our way."

I don't travel to other countries and say stuff like that. I follow local customs. I bag my own groceries while in Europe. I refer to the "lift" and the "toilet" instead of the "elevator" and the "restroom" while in the UK. I eat pizza with a knife and fork, instead of picking it up with my fingers as is usual in the US.