Business Insider spoke with nine Costco employees who said they cringed when customers exhibited certain unhygienic behaviors, like putting membership or credit cards in their mouth or bra or failing to wash their hands in the restroom.
An Illinois-based Costco employee said they hated "... when they pull their card out of their bra or mouth."
"It's gross," said a Costco employee in Minnesota, while an employee in Idaho said this especially becomes a problem during "flu season."
"I hate when they have their membership card in their mouth and then hand it to me," a Ohio-based Costco employee told Business Insider. "Ew."
An employee in Chicago said they judged people who left the store's restroom without washing their hands, adding, "That's disgusting."
Two employees in Illinois and Ontario specifically called out people who cough and sneeze all over the warehouse without making an attempt to cover their mouths.