That's admirable that you didn't spit in anybody's food, but why is it stingy not to tip for counter service, or did you have wait staff at your cafe?
It seems to me that if someone takes your order and cooks hot door for you and a place you go to twice a week, it’s decent to tip at least occasionally. If staff knows your name and order and remembers details about you, but out always select no tip, that’s pretty anti-social.