I have over the years I think actually mastered the art of "I know you personally, person on the phone, aren't responsible for the thing I am calling about, but please help me make sure this makes it way up the chain of command" polite conversation.

I asked my adult son "just take a moment to notice how many people are coughing on the plane and in the airport". He didn't take his mask off once, and he had only reluctantly masked on previous flights.