I find that the long form isn't necessary.  I never wear a mask when shopping.  Generally I'm politely asked if I have a mask, and I reply "Can't wear one" and walk on.  Most who ask are low-level employees who don't really care, so it rarely goes beyond that.  One time, a manager wanted to press the issue and I said, "Governor Murphy's Executive Order #122 provides certain exemptions.  I suggest that you read it."   Used the Jedi voice...you know--these are not the droids, etc.  LQL!