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I moved this to Current Events & Debates because it seems more fitting there.

If this server did literally nothing for you, not even giving you one item, I think it's valid that you didn't tip her. I mean, she didn't SERVE you anything.

But I try to tip in most other situations. If the food was bad it's not on the waitress so I have the waitress have the cook remake the food but I'll still tip. I'm bad at reading facial expressions so I sometimes think people are upset when they're not, or I'll read them as neutral or content when they're actually upset. So I try not to go off scowling or other facial expressions. Whether the tips are shared or not I still tip because someone's putting in the work and waitstaff in restaurants in the US tend to rely on tips for most of their income.