This reminds me of the people that say they are anti-antifa.
"Anti-propaganda aims to undermine the effectiveness of propaganda by exposing its manipulative tactics, providing alternative perspectives, or offering factual information to counter biased claims.
I’d pick my battles and try to address the most harmful lines of thought first. Like anything medical for example. Deprogramming is a popular topic online so there are some resources out there.
Best of luck, it’ll be difficult until you find a foothold.
Give it a week.