probably a defense mechanism from having to deal with the advances from all the balding, pot-bellied, black-sock w/ gym shoe wearing, 40-something-but-drives-a-bmw-so-thinks-he's-hot-stuff jerks that try to pick up on them.
All the girls at mine are flirty. To date I have nailed two Gold's counter girls. You guys must look like shit if they are rude to you. They always hit on guys that have a nice body or face.