I stopped even arguing it. I just calmly state that I am not scared of the virus and will not subject my family to an experimental vaccine for a disease that does not affect me. I tell them that if they are at all scared of this virus, my recommendation is that they continue to remain isolated and get the vaccine as quickly as possible, to be safe. I also remind them that CDC guidelines say they are taking a major risk even being here amongst the unvaccinated having a conversation. I always reiterate that I may have COVID and could spread it to them at any time. I have found that this very direct approach tends to knock people back and quickly get them to either leave for good or never mention COVID to me ever again and start acting more normal. It works either way. It's a stupid debate. It's like debating the existence of Noah's ark with fundamentalist Christians. Just a completely pointless exercise. They believe based on faith, not any rational or logical foundation. Not even worth your time.