[Coda]

I tip well, too, unless the service is bad (which generally means "negligent waiter"; I don't blame the wait staff for things outside of their control, like the behavior of other patrons, or a special order being ever-so-slightly wrong). Then, of course, I don't tip well. That's the point of a tip.

Edit: But I DO still tip. A low tip sends a lot better signal than no tip at all; no tip at all just makes you look like a cheapskate, not someone who was dissatisfied with the service.