I know from personal experience that Menards and Jersey Mike’s both go beyond the mask mandate and do not allow medical exemptions.
What I can’t figure out is why any company is willing to alienate customers over this. I will never eat at Jersey Mike’s again and I choose Home Depot now every single time. We live in a fixer upper so we are constantly shopping for materials.
Why are so many businesses going well beyond the mandate?
Well you might consider that a lot of businesses are being fined into non-existence. A lot of these small businesses lose either way.
Liability/insurance/lawyers.
No business liability "shield" was passed by Congress.