And the follow up should be...

Why aren't you?

No one ever challenges me on wearing a mask... I have so many pithy replies I want to try out

I don't work with immunocompromised children, so my response would be "you own any handguns?"

Tell him to wash his hands for the next customer and don't go back.

These days my response to people like that is an icy stare and “how is that any of your business?” said in my very best just one more word and I’ll make you cry voice.

my favorite line to those guys is “don’t tread on me”

Picking up a sandwich is a revolutionary act these days :)