I generally like Walmart far more than I should and defend their sourcing ethics and quality far more than I'd like - that said, there are some real jerks working at this particular Wal-Mart, including the cart caretaker, the frozen foods produce wench, and the dude haphazardly chucking heads of lettuce into a bin to ensure their short shelf life.
Don't get me wrong folks, I know your job sucks, but at leas try not to make the customers shopping with you feel bad about their decisions.