You should have enough respect for your date to be in clean clothes, smelling nice and have your hair brushed.Make eye contact to demonstrate your interest in your date.On a similar note, it is generally considered rude to ask questions about your date's sexual past when the two of you are in the getting-to-know-you stage.
You also want to be honest with your date and let them know, as kindly as possible, that you are not interested in continuing the relationship if you aren't feeling a spark.
You will undoubtedly make your date feel uneasy if you snap at the waitress. Unless you've already established a relationship with your sweetie, don't become "all hands." This is one of the quickest ways to make someone incredibly uncomfortable.
If this is your first date, it is best to assume that sex is not even an option.
Dates are supposed to be enjoyable, not uncomfortable.
You should also be polite to the other people you encounter on your date, including servers.
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No matter what type of day you've had, be polite to your date.