If the sign on the front of the Kwik-E-Mart says that shirts and shoes are required to enter, then I put on a shirt and a pair of shoes or I don't enter the store.
If Costco's policy is that a mask is required for entry into the store, then I either put on a mask to go in or I turn around and walk away.
There is no small amount of sentiment here against these business owners. If you don't like the mask policy, then vote with your wallet and stay out of the store.
But don't go into the store without a mask because you're speshul and then tell everyone it's just a hoax. (Because when you do, then you're failing the IQ test and missing the point.)