These types really are the worst. We need a specific word for these people. And it needs to be something new, so it grabs people's attention. It's not just that these people think that they know everything, it's that they think they can know everything via Scientism/empiricism/trusting experts. It's really revolting, I find it demeaning, as if everything about the universe can be perfectly quantified and understood in a laboratory. It just feels disrespectful, there's no mysticism, just sterile meaningless facts. Lots of these people are indeed really smart and at the same time so... depressingly shallow.

What do we can these people? Snopesatarians? Factcheckertarians? I don't know.