It went down in L.A., where COVID is out of control. She approached the counter and got immediate pushback from staff who said she wouldn't get service unless she wore a mask.

The woman blanched at that, firing back it's "nonsensical" to treat healthy people like they're sick. The staff properly asked how she knew she was healthy ... she said she had no symptoms and felt fine. Of course, people with COVID can feel fine in the early stages and, for that matter, even as the disease progresses and still transmit the disease.

She seemed to be saying 2 things ... suggesting she has an underlying condition and can't be refused service, and then saying she's a perfectly healthy person.

A nurse who happened to be in the store tried explaining how bad COVID has ravaged L.A., but she wasn't having it, saying "asymptomatic spread has been shown to be a myth."

She claimed she's entitled to service. Fact is ... they have an absolute right to deny her service. If a store demands someone wear a mask and they won't, they can pitch a fit all they want ... they're not entitled to service.