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.
Getting people to rationalize during a session is actually quite a challenge. What we have are exercises meant to illustrate situations that people might find themselves in where rationalization is likely. And after a dozen or so examples, this particular subgroup - about 25% of our tested population so far! - just flat-out does not relate to any of the examples.
However, one of them seemed to get "caught" by one example after a friend of theirs explicitly pointed out the analogy to their life. We haven't yet followed up on that case to explore more solidly whether it's really denial or if it was actually our misunderstanding and this person really doesn't rationalize.
Presumably you can do it for other cognitive biases, so what's so special about this one?