Funny you should mention that.
When I lived in San Diego near my youngest brother, he and a few of his buddies and I would go out for beers at a local No San Diego pub about once a week. Custom was to rotate the picking up the bill. Most all his buddies were good to go. My brother (a liberal lawyer) most often copped some sort of excuse why he should not pay.
He did not know that his buddies smirked and nodded behind his back as they expected the check dodge from him.
Were he not my brother, I would have nothing to do with him,
I can top that.....
We had an Air Force Captain (I was one, too) who was married to a woman who was also making good money. DINKS -- "Double income, no kids".
First Friday of each month, we'd have "Officer training" for our division at the all ranks club. Basically the training was an excuse for Happy Hour -- training lasted 15 minutes most months.
Anyway, each time we went out, this captain would collect all the money and pay the tab with his credit card. Not a big deal. We figured it was a free loan until the bill came due, or maybe he was racking up reward points.
We're talking about 20 or so officers, some with spouses/guests ponying up their share of the check. About the 6th or 7th time he collected the cash, one of our other Captains looked over as he signed the credit card receipt. To be helpful, she said, "If you're not sure about the tip, 20% should be about $XX.XX."
His reply: "I don't believe in tipping."

All that time, he was collecting everybody's cash INCLUDING TIPS and stiffing the servers.
By pocketing the tip money, we were basically paying for his food, drinks, and a bonus of whatever was left from the tips -- all for the privilege of his company.
Some people.