Surely this is discrimination? Some people who can't wear a mask can't wear a visor either (I can't, I have trigeminal neuralgia and can't tolerate any pressure on my face/head/temples). There are other conditions which make wearing them impossible, too. I'm sure the government guidelines state this sort of action isn't permitted?
I don't shop at Costco personally but I'm so worried other places will follow suit (and no, I can't avoid shops sadly - no delivery slots for months here and I don't drive so no c&c. Also no friends/relatives to shop for me).
Yet another layer of anxiety and worry 