I'm literally speaking about a specific person and your speaking in hypotheticals, she wears a mask but assholes who go into her shop disregard her signs and do whatever the fuck they want. Why shop at a store that infringes on you, take your money somewhere else seems to solve this problem.
You have to see the argument from both sides: store management and customer. It's not hypothetical. I know business owners with medical issues that might keep them from wearing a mask 8-12 hours a day while they work. That's much more problematic than a customer who just comes in for an hour or less.
Laws protecting certain classes from discrimination are exactly why you don't want to just go somewhere else. What about the 3, 13 or 300 others who wanted to shop there for the past few months and could not because of mask rules?
This is not about a simple disagreement over store policy. It's about following federal law. Can a store make a policy that wheelchair ramps won;t be installed? How about elevators for moving between floors in the store -- only escalators and stairs?
Sorry if you feel differently, but as I said, there are reasons businesses have to comply with accessibility accommodations. Not everyone is healthy enough to access all businesses without reasonable accommodations. At this point, I think we're just arguing over what's reasonable.
I'd be okay with a "Non-mask-wearer screening" at the entrance to take their temperature and observe if there are any COVID-19 type symptoms. Of course, that should also be done on everyone coming in -- just to be "safe".
There is an organization trying to push for a COVID-19 "passport". You take a test, and if it's negative, you get a code on your phone to show to anyone -- like at a store with a mask policy. That way they can let you in without fear that you have the virus.
The obvious flaw here is there's no way to maintain that status of being virus-free after the test! Nor is there any way to guard against false negatives. It's another example of the shortsightedness we have to live with as people refuse to accept what can, and can't, be done to stop the spread.
Let's say masks cut the rate of infection in half. Given that success, why stop there? Isolation can drop that new total another 50%. Shutting down businesses and schools forever will stop it up to 95%. The issue becomes whether or not the "cure" is worse than the disease. If I live alone and need to shop for food, home repair items or take advantage of a local sale on coffee, I should not be excluded from those businesses if I have a valid health condition in which masks worsen that condition.
I remember stories of when the general population placed the sick in isolation for the rest of their lives, cast out of society, out of fear of contracting the disease. Maybe it's time to bring back the Leper Colonies?
https://www.history.com/news/leprosy-colonies-us-quarantine