I don't think you will get to redefine Karen as someone who wears a mask. Every "Karen" video I have seen is either a racist or someone who refuses to wear a mask. I have seen a video were "Karen" both refused to wear a mask and was saying racist things. The best way to take on the term Karen isn't to redirect it toward some liberal idiot with blue hair and tattoos. Just say "Karen" is a sexist and ageist stereo type. The real victims of racism are white people. Nobody says the n-word and gets away with it. But everybody uses the term Karen.