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.
Maybe you could give some examples of the sort of rationalizations you're referring to in your post, so we would better know how to answer your question? I think I might fall into this category, but I might not. I frequently think it would be a good idea for me to do something, but I don't do it and tell myself I lack the necessary psychological strength. Is this rationalizing? Also, I sometimes experience ugh fields around learning things that might be uncomfortable (in this sense a student might be afraid to see what score they got on a test).
I don't claim to have always been this way; I was famous for lawyer style argument in elementary school. Just with exposure to less wrong (which I found somewhat early, at age 15).
Edit: I now no longer claim to not rationalize, only to do it fairly little, and I'm fairly uncertain about the entire issue.