Treat guests rudely
"What gets my goat is when bartenders are just rude to guests. If you can't wipe your feet and check your shit at the door, you should not be behind the bar. People have off days; bartenders don't. We are always there for the guest, without the guest we do not have jobs. Why would you bite the hand that feeds you? If you want to be a prick, go be a meter maid." -- Billy Ray, 13-Stitches (Los Angeles, CA)
Contaminate drinks with dirty hands
"When you count out those three 20s, a 10, a five, and three ratty-looking $1 bills to the guy leaving the bar and then take my order, I would love it if your next stop was the hand-wash sink." -- Dale "King Cocktail" DeGroff
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Dan Gentile is a staff writer at Thrillist. The thing he thinks bars do wrong is keep a sloppy tray of ill-sliced lime wedges. Follow him to symmetrical citrus at @Dannosphere.