EO would override that law
However, it's businesses that get fined, not individuals.
Plus you can challenge a state EO.
You'd probably stop prosecution dead in it's tracks if you explained/showed Northam not wearing a mask in public. There are tons of pics out there.
Wear gloves instead. Much more effective, and if you get harassed, you can make a point how the opposition is putting others at risk
Bonus: The cops won't be wearing masks.
Bonus 2: Ask a cop what law you're violating, and they won't be able to show you.
Semantics won't hold up in court.
control is powerful :)