Coming from a bartender's perspective, here's how I see it: When you come to my bar, you're in MY HOUSE. So what does that mean? It means it's my job to be a good host, be charming, accommodating (to a certain point), attentive, well-collected, ect. While I won't be 100% on all of these at all times, it's still my job to do my best to be a damn good host. I'm hosting the party and I want everyone to have a good time. On the flip side, it's your job as a patron to be a good guest. Be gracious, understanding, civil, ect. If both parties fulfill their roll in this social contract, every thing should go off without a hitch...