This was years ago as a teenager.
My highschool job was as a shelf stocker at a Canadian pharmacy chain called Shoppers Drug Mart. It also has cosmetics, diapers, some groceries, and other such things.
One day, after a shift, my mom came to pick me up, as I wasn’t yet old enough to drive myself. She was headed to Costco, so I had to come with her. She has MS, and at the time simply walking a long distance was like running marathon for her, so I was happy to come and pull stuff off the shelves for her. Anyway.
There was a good sale on flats of bottled water, so she had asked me to pull a couple flats off of the large pallet that had been left in the aisle. I pulled a couple down, and put them on her cart, when suddenly some random Karen decides I should get HER some water as well. You see, I was still wearing my uniform shirt from my actual job, nametag and all. The exchange went something like this:
Karen: Oh, I’ll take 3 of those.
K: the water, get me 3.
M: uh, I don’t work here.
K: well you’re wearing a uniform! You have a nametag!
M: a uniform and nametag that both say “shoppers drug mart”. This is a Costco.
K: I’ll complain to a manger!
M: again, I don’t work here. (Eyeroll, walk over to my mother, who has already started to leave)
K: well you don’t have to be so rude!
And that was that! I’m a pretty big dude, and don’t usually smile unless I’m actually happy about something, so people usually just leave me alone. I guess all it takes to become the servant of some Karen is a shirt and a name tag, even if that shirt and name tag looks absolutely nothing like those of the actual store employees.