You're right. I am absolutely not making the argument that Krugman is bad because of the quote. I'm asserting that Krugman is bad, because I know that to be true, without offering proof, which would be outside the scope of an HN comment.

Separately, I'm also adding the quote to make fun of him.

I didn't expect people to take my comment as some sort of intellectual argument. As you point out, obviously, it is not.