On a normal day, servers and bartenders have to deal with customers snapping at them, yelling at them for things that are entirely not their fault, throwing temper tantrums over their missing side of ranch dressing, letting their screaming children make sticky condiment paintings on the table, and generally treating them as food-carrying disposable robots. Now, they have to do all of that while sweating under a mask to protect customers who are not doing anything at all to protect them.
You can definitely learn a lot about a person's character by simply analyzing how they treat a waiter, and if you're dining with a person who can't even make eye contact with a server, say "thank you," or ask for an extra knife, you have a whole field of red flags on your hands. So, when a dad needed to consult Reddit's moral compass of "Am I the as*hole?" about his decision to ground his daughter for noticing his new girlfriend's rude manners, people were quick to share their opinions.