I ALWAYS leave a tip only when I enjoy he services rendered. I can’t experience a horrible service, pay for it and still drop tip again. I don’t have problem dropping the tip so far your service is great. There was a time I had a waitress that completely ignored me despite the fact that I was her only customer, preferring instead to flirt with who I assumed was a boyfriend. Instead of dropping off the tip, I took out a little shot of paper and wrote “When it comes to waitressing, you’ll make a great hair dresser.” At this point in my life, I have eaten in a lot of restaurants and no one can force me into tipping if I don’t experiment a good service.