For your information...
suggest you look up your state, county and city have official legally binding orders and rules regarding the wearing of face masks.
Search for the phrase "does not apply" to find a list of what are in effect "exemptions" .
There is usually an "exemption" in all of these official legal orders and rules
regarding
"any person with a medical condition or disability that prevents wearing a face covering"
All you need to do when you go into a store where you do not want to wear a mask is say, if you are asked,
"I have a medical condition and disability that prevents me from wearing a face mask."
say no more and say no less.
It says so in one of my states rules and orders related to the "virus"
https://lrl.texas.gov/legeLeaders/go...&governorID=45
https://lrl.texas.gov/scanned/govdoc...2020/GA-29.pdf
Governor Greg Abbott ExecutiveOrder
GA-29 July2,2020
Page 2
If a store proprietor questions your right to not wear a mask you can quote the Governor's executive order number and page, or whatever document you have.
You do not have to present any proof of any kind regarding your medical condition or disability and if a commercial establishment tells you have to leave the store because you will not wear a mask, you can tell them that they are discriminating against you because of your medical condition or disability. Tell the store proprietor 'I suggest you look into the fine for denying service to me for discrimination against me."
If you can find a legal document that shows a fine and dollar amount about this tell them that, if you have that document in your knowledge bank.
If the store person still wants to kick you out of their store, just take out a pen and paper and ask politely the person's name and position title who is telling you to leave the store. Then you will probably not have to leave the store because they think you might get them fined or you might file a personal law suit, which you definitely could if you do have a medical condition and disability that prevents you from wearing a mask.
I think I may try this tomorrow.
P.S. you may not want to try this at a restaurant because some mentally ill mask-mugger type might poison your food.