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: So my coworker took me out to dinner one night since we’re both here on a project and he paid with a company credit card. He makes a joke about how his boss got onto him for spending too much at restaurants while traveling some time and he mentioned it’s because he usually tips around 20% which I thought no big deal. 

Now for some context, my coworker has been working here ~10 years or so and I just started so he’s not exactly my boss, more like a mentor, so he does have some superiority over me(idk if that’s the right phrasing but hopefully you get what I mean). 

Where things get questionable is when the bill comes by. The total is like $69 before tip, so to tip 20% he puts under the tip $14. No big deal. However he did the mental math wrong somehow and put $73 for the total instead of $83. I noticed it but didn’t say anything because I didn’t want him to think I’m smarter than him or make him feel stupid especially since I’m new and don’t want to start things off on the wrong foot with a mentor. Now AITA for not saying something since there’s a chance that the waitress will only get a $4 tip on a $69 tab? 

I genuinely don’t think he did it on purpose since he just said he tips 20% and he’s also everything but an asshole. I just don’t know if what I did could be considered assholeish behavior. 

not correcting my coworker on how much he tipped