So, when a Reddit user asked, "What's the best way to piss off rude customers within company guidelines?" people who work in retail and the service industry were ready to share their favorite trick to shut down an entitled patron. "I hope you have the day you deserve!"
I used to bartend in Austin on 6th street, so I had to deal with a ton of entitled fratboys. One guy ordered a beer, chugged it in front of me, and set it on my spill mat. For the uninitiated, this is the universal sign that someone has finished their beverage.
I pick up the bottle and it had less that an ounce of backwash left in it, and throw it away. The fratboy then gets angry, saying he wasn't finished, and demands another beer for free. I told him I would be happy to replace his drink.