My 81 year old mother has been a loyal Costco customer for years. She always bragged about the superior customer service at the Marks location in Henderson NV. We were treated so rudely by the predominately Latino employees. I could not beleive the ignorant aggressive behavior we suffered. My mother moved too slowly to pay for her food and was told to "move faster there were other custumers behind her". We were embarrased at the door when one of the Latino employees yelled at her to show her receipt which she had in her hand. The staff should represent the customer base. Where is the diversity? I guess the Latino staff didn't feel they had to treat us with the superior standard of customer service my mother bragged about at the Henderson -Marks location. We did complain to a manager however I am not confident anything will be done. Shame on you Costco!