Face masks in Michigan: What are the rules?

Signs of the times are everywhere at Borchardt Brother's Market in Blissfield, Michigan.
From markers on the floor to keep customers six feet apart, to a reminder before you set foot inside, "Please wear a mask for everyone's safety," the store spells out the rules laid out by Governor Gretchen Whitmer.
But what do customers think?
“We’ve had a few people come in without masks," said Andy Borchardt, store director of his family-owned business. "We remind them we’d appreciate it if they do wear it. We’ve had a few people say that they don’t want their constitutional rights taken away.”
Borchardt said he provides masks for his employees, who are required to wear them. Under the latest executive order in Michigan, customers are now also required to wear them, unless they cannot medically tolerate them.
The order states: "Any individual who enters a food-selling establishment or pharmacy who is able to medically tolerate a face covering must wear a covering over his or her nose and mouth, such as a homemade mask, scarf, bandana, or handkerchief."