Listening to Springs1 talk about her service at restaurants reminds me of when I used to have a residential pool route. I would occasionally get a new customer that had absolutely unreasonable expectations of what the pool service should include. I remember get chewed out by a customer for over a half hour because when I finished servicing the pool she came out and found a leaf that I had missed. She actually said a few things very similar to Springs1 during her rant. "You work for my money, so you're not done until I say you're done!" Needless to say that was her last day as my customer.
The point is, like others have suggested, I think that servers can get a good read on you within the first couple of minutes of conversation. By that time they already know that you're going to be unreasonable, demanding, and probably aren't going to tip very well. Your subsequent service reflects that. When I had my own business I had the option of just cutting customers loose when they were unreasonable, but servers don't. I suspect if they did you wouldn't be able to eat at any restaurant within a 100 miles of your house.
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