If the cashier was a woman, there is no reason the customer should have refused to remove her veil. As long as there aren’t any men around when she removes it. And why is a “religious” Muslim woman pumping her own gasoline anyway? Isn’t her husband with her?
Indeed, according to her "religion", she shouldn't even be driving a car.
"I'm sorry, ma'am, I too am a devout Muslim. Certainly you realize that our religion requires me now to stone you to death for driving an automobile..."
In saudi she´d be stoned to death.