Why does every foreigner think they HAVE to tip in the U. S?

Why does every foreigner think they HAVE to tip in the U. S?

I swear, the biggest complaint I hear from foreign tourists is that they HAVE to tip! You don't HAVE to do anything! There are no laws and no one is extorting tips from you like in other countries. If you don't want to tip, don't tip. Simple as that.

In EXTREME cases you might get scolded, but the worst that'll happened is they'll think you're an asshole and will badmouth you to their coworkers. So what? You'll never see them again!

I rarely tip, even at the places I frequent regularly. Only person I tip is my barber.

Why does every foreigner think they HAVE to tip in the U. S?
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