Let me tell the lurking DUmpasses how this REALLY goes, because I have encountered this myself only a couple of times over the past 2 years playing the role of Evil MAGAT.
- Me (Evil MAGAT): Walks into store without mask
- Clerk: Sir, would you mind putting a mask on?
- Me (Evil MAGAT): No thank you
- Me (Evil MAGAT): Turn and leave store without further incident or comment
And it should be noted that in my area, there are no known retailers remaining who still mandate customer mask wearing. Most of us leave and shop elsewhere if that is the case.