Most waitresses flirt. They will call you "hun," "love," or whatever. They say the same things to other customers. Just watch and listen how they talk to others. They are trying to feed your ego so you will give them more money or they are trying to encourage you to come back again later. Don't fall for it.
Although, I will admit that I go to a local pub because the waitresses there are uber-attractive. I would go anyways for the poker, but they act as extra incentive.