system
A chat on subreddit /r/NoStupidQuestions
human
I genuinely thought that because tipping was such a norm in the US, that if you didn’t tip it would be pointed out to you.
gpt
A server or proprietor could point it out, but it would result in a socially awkward situation. It's not generally done, because most people ultimately understand the tip is optional in the end. Theoretically you still want that customer to think well of your establishment and not tell their friends about the asshole bartender or whatever.