"I'm sorry sir but you have to have a mask on to enter our building"
"I'm sorry bud but I have a medical condition that when I wear a mask I have trouble breathing"
A good start, but TMI.
Don't explain the medical condition.
They ask what it is, you out-liberal 'em.
Tell em it's a violation of HIPAA for them to require that information, and a $50,000.00 fine if they persist.
Then, tell em it's a violation of the ADA for you to be denied accommodations due to a physical infirmity, up to a $75,000.00 fine for the first offense, $150k for the second.
