You've just contradicted yourself. On the one hand you state critical thinking is key and on the other hand you dismiss questioning popular opinion as crazy.
Conspiracy theorists usually show a strong belief in something pretty improbable without a shred of tangible evidence. I think it's fair to label them as "crazies" because they tend to be very vocal about it and impervious to logical flaws in their own theories. And they're annoying, when you annoy people, you can expect some kind of negative feedback, like being mocked or called names.