I’m kinda curious... as a non-server, what kind of things tip you off that you are not going to be tipped well? Are you usually right?

I used to be a hostess, and I know obviously the typical bad tipper stereotypes, but I’m curious about what other red flags there are, maybe more subtle ones. I don’t eat out a ton (I’m by myself so I tend to do take out, which I always tip for) but I always tip well (unless service is blatantly bad, then the minimum 10-15%)... but I do appreciate servers and like to show that, I also want to be conscious that I don’t do dumb little things to make them think I’m gonna stiff or shaft them.