Anna Salamon and I are confused. Both of us notice ourselves rationalizing on pretty much a daily basis and have to apply techniques like the Litany of Tarski pretty regularly. But in several of our test sessions for teaching rationality, a handful of people report never rationalizing and seem to have little clue what Tarski is for. They don't relate to any examples we give, whether fictitious or actual personal examples from our lives. Some of these people show signs of being rather high-level rationalists overall, although some don't.
Perhaps something related to social inaptness or perceived social status, on the hypothesis that rationalization originates as a social psychological drive? I have a few broken social modes, for example there is no emotional drive to avoid pointing out errors or embarrassing facts to people, so I need to consciously stop myself if that's called for.