I am telling you now. It doesn't matter if you get a doctor's note (which we had) they will not let you on the plane unless you mask up. We therefore haven't flown since the mandate and drove to DC and Houston (from GA).
So decide now: mask up and make it to DC. Or cancel your flight and drive.
And if you wear a pro-Trump one or a MAGA one they will say you're trying to be offensive to other passengers and will try to kick you off for that too. They've already tried it