One source of crackpots is people who encountered "postmodernist" ideas telling them that science is sexist/racist/whatever, and who then make the jump to think

One source of crackpots is people who encountered "postmodernist" ideas telling them that science is sexist/racist/whatever, and who then make the jump to thinking that anyone can contribute scientific theories without having to understand the canon, because the canon is part of the sexist/racist institution.