Whenever those POS ask for a tip I always click "no tip" and I learned to not worry about what someone else will think. I felt pressured the first time, but I learned that nothing happens if you don't give a tip. I believe those go straight to the owner anyway.

I still have some hangups about when I am in a restaurant and I still do tip as this is still expected. I just stopped going to restaurants, and I only end up there is someone drags me in.

I hate that whole tip cancer culture, which essentially exists to cheat me to think I'm paying less.