That's right, hammer out those snotty rejoinders.
So here's a question: If you're vaccinated, and I'm not, how exactly am I a threat to you?
Wish Kat were still alive as I could just ask her these things and get a competent answer.
But at a guess. A: You arent a threat to vaccinated people. You are potentially threatened by anyone else at the con not vaccinated and carrying, or who picked it up on the way. And if you get it then its going to potentially spread to anyone else not vaccinated.
Or think of it in game terms. Its not the characters immune to the mutating magic curse you have to worry about. Its the ones that can and probably will mutate that you have to worry about. This is probably how the blue drow came to be.
At the end of the day though its their con and their rules. Or the venues rules the con has to abide. Or state rules the venue and the con have to abide. I've been to two that for example had a no alcohol rule. In one case that was the hotels rule. And in the other case because the con manager didnt like it and so set the rules.