Does anybody actually dispute that?

Depends on what connotations are implied. There are certainly people who dispute, e.g., the (practical relevance of the) H&B results on confirmations bias, overconfidence, and so on that LessWrong often brings up in support of the "the world is mad" narrative. There are also people like Chesterton who placed much faith in the common sense of the average man. But anyway I think the rest of the sentence needs to be included to give that fragment proper context.

For what it's worth, I don't hold that position, and it seems much more prevalent in atheist forums than on LessWrong.

Granted.