First off, focusing on racism exclusively when discussing fascism and nazism erases anti-semitism, homophobia and misogyny. Call-out culture rarely works to change people, it only makes the therapy left feel better. People are changed by suasion, the difficult political work of connecting with people and working with them to change minds.
It is not possible to change the minds of nazis and fascist organizers. They are not doing what they do because their families did not call them out. They are not doing what they do because they are medically ill. They do what they do because they want to.
It is possible to outreach to those who might be susceptible to recruitment by the organizers. And it certainly is possible for us to raise the cost of recruiting by making it as painful and uncomfortable as possible for them to organize.
This notion that political differences can be medicalized would be right at home in Germany of the 1940s.