I've begun using the term "epistemologically disabled" to cover those in the general class of crazy people that includes flat-earthers, anti-vaxxers, chemtraile

I've begun using the term "epistemologically disabled" to cover those in the general class of crazy people that includes flat-earthers, anti-vaxxers, chemtrailers, climate change deniers (anthropic or not), "Obama is a Kenyan Muslim" republicans, &c. Because seeing this problem as a disability changes my response from contempt into one that's more sympathetic.