Working as a bartender, your job revolves around customer service. Your job is essentially to take of the customer. You make drinks, suggest items off the menu, and cater to the customer whatever they might desire. If you make a mistake as a bartender, it's your responsibility to fess off, apologize and correct your mistake.
Today I was having lunch at the bar of a restaurant. I enjoy eating at the bar because you get to watch all the action and usually get served faster. My bartender misrung my order so when my food came out, it wasn't what I had ordered. I had to send it back to the kitchen. I hate having to send stuff back to the kitchen, but if it's wrong then it's wrong.
What made the situation shitty was that the bartender made it sound like it was my fault. Instead of apologizing for his mistake, he told me he heard me say something else. He should have just apologized right away. Then for the rest of meal, he ignored me. Never once checked on me.
I realize that some customers out there are a pain the ass. I get that. But there is no reason for a bartender to get upset with a customer when it was clearly the bartender who made the mistake in first place.