Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: Last night I was out at the club with a bunch of friends, I don't go all that often so I'm not 100% on the etiquette. 

I was at work before I joined them so I was a little behind the pregame and decided to go up to the bar and ask for a shot.
They pour my shot and tell me it'll be 5$. I hand them my 5$ bill and the bartender just gives me this annoyed look followed by the bartender next to her in the booth saying to me in a snarky tone, "you know it's customary to tip right?"
I just looked at them a bit surprised and said, "sorry I only have 5$ on me."
I had a bit more obviously for later in the night but they seemed fine, although not happy, with that answer.

AITA for not wanting to tip someone for pouring me a 5$ shot??

not tipping the bartender at the club