I used to work as a server in hs. I also don’t think it is okay at all to be rude to a customer, but I’m saying that I tip the person even if they aren’t super talkative or even if they aren’t checking up on my table as much bc they’re super busy. I haven’t had many experiences where a server has been straight up rude to a customer, and if that’s the case then I’d probably only tip like a dollar bc thats wrong