Some customers go beyond rudeness and actually resort to violence in Costco stores.
A Reddit user who said they'd worked at Costco for seven years described having a customer attempt to start a fist fight in a 2013 Reddit AMA.
As the story goes, the individual in question had left the line at checkout to go grab bread, and the Costco employee rang up the people in line behind him.
When the member returned, he became infuriated after being told he had to get back in line.
"He got right in my face telling me he could lay me out right then," the Costco employee wrote. "I remember telling him that if he hit me I'd get some paid time off from this place, so go for it. Management kicked him out because he was causing a huge scene. Members clapped when he left. I felt like a hero."
In her Refinery29 piece, DeMaria also noted she was once slapped by a member during "an argument about the membership she was using."