My experience in State w Mask Mandates:
Don't wear mask.
Walk in store like you own it.
Get what you need.
Check out.
When you see a cashier giving you a surprised expression,
Give a nod and ask them how they're doing.
Exchange another pleasantry or two if so inclined.
The end.
Masks, as stated, are to cover noses and mouths, no specifications other than that (last I checked).