I go maskless when possible. If someone were to say something to me about it, I’d just ignore them. I don’t like conflict. I’d continue ignoring them until (a)...their harassment becomes too abusive, or (b)...they touch me. Then I’d call the police.
My nephew handled a Karen very well the other day. Jason is about 6’-4” and weighs about 250 lbs. This woman came up to him and demanded to know why he wasn’t wearing a mask. He said “ because I’m not a fuc*ing sheep!” She immediately slinked away.