"When I go grocery shopping lately I've started pushing it halfway down my face so I can breathe through my nose."
Ohhhh, you rebel, you)
Better, do your research, know your rights, DON'T wear a mask, challenge them to call the cops, demand a lawyer, demand a trail, risk it all, win and sue.
As much as I despise the whole mask wearing show - and I've not worn one since the end of April (it's been mandatory in my country since mid-April) - you're sounding a bit condescending, aren't you? You need to ask yourself, what is the goal of not wearing a mask. You come off as wanting to get challenged so you can show them you're better than them. That's pride - and believe me, I struggle with it too! From my experience, if they ask you to put the mask on, being extra polite is the best way to defuse the tension and potential argument. And if they're really persistent and unpleasant, just say 'Have a wonderful day!', smile and leave.
At the same time, I don't believe it's a sin to refuse to wear a mask. Shouldn't law be just and intuitively (as much as possible) comprehensible? The science they love so much had been pretty much settled that masks don't do anything in terms of containing the virus yet it changed completely in the last couple of months and this BS is being sold now as pretty much the best and only weapon against the 'rona. On top of that, the masks and even the visors can and do cause health issues. And yes, in many states/countries they're enforcing this policy illegally as there is no actual law backing it.
So, my conscious is clear. Sure, it might not be the hill I will be dying on but it doesn't mean I won't fight.