I think anyone who has ever worked in the service industry are generally good tippers. I waited tables for exactly 3 months and it was the worst fucking job I ever had. Therefore, I always make sure to tip well, 20-25% standard, more if they're excellent. The only time I've ever not tipped was when I ordered, ate and then realized I forgot my wallet and had to dine&dash. (Which was only once.)
As for the rules, those are just common sense. The only one I can see an exception to would be coughing. Sometimes that just can't be helped. Of course you cover your mouth and if a coughing fit ensues, head for the restroom, but let's face it.... If you've ever inhaled while drinking anything, you've probably coughed at the table before. It happens.
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