Had dinner in Brooklyn last night. 4 ppl. Bill came $159 pretax with final bill being $173.

I had to $100 bills and a $50 in my pocket, so just paid $200 out of convenience.

To my surprise, the waitress comes out and gently interrupts our conversation asking if our service was fine or not. We were all kind of confused for a moment and I ultimately took the bill to the side and paid an extra $10.

Service was just regular. The food was good.

Never had this happen before & feeling like an asshole. Is the expectation 20% now? Was $200 on a $173 bill considered rude? It felt like a pretty awkward end to an otherwise decent meal.