If they dare knock on your door wearing a mask demand the remove it as masks are not allowed to be worn on your property ... policy, you know. Only say that twice then quietly close your door without further comment.
Or tell them that you are hard of hearing and need to read lips and then answer them in an obtuse and annoying way.
Them: “We are asking people if they got the COVID vaccination?”
Me: “What, you are want me to help you with an assassination? Harriet, call the police. There are two girls here who say they are plotting an assissination.”