Nothing is going to happen, but there is something you can do. Make sure they hear this message in their boards: "You had your time. You enjoyed strongarming others into unconsented medical treatment. Your time is done, so listen up. I'm not vaccinated, I won't wear a mask. I wont take a PCR and won't isolate. Scared yet? There's many like me, we're all around you". Obviously we can't really harm them, but we can make sure they continue to mentally torment themselves