- They think "questioning everything" makes them smart even though many questions are answered to a point where being contrarian is irrational.
- They're generally just anti-intellectual. They enjoy talking about stuff without introducing any rigor.
- Probably the most interesting to me; they tend to have rather isolated jobs. I suppose they haven't been exposed to incompetence at scale.
You're right, it's not correct to just lump everything into one bucket. But when they seem to be pushed by a different incarnation of the same person every time, I get desensitized. Especially because, when I do bite and ask some follow up questions, I never seem to get any answers.