Ever since I was little I would always be singing and dancing. I learned dance moves from Michael Jackson and *Nsync. My brothers, Rydel, and I would always put on shows for family members in our basement and we charged everyone $1 to get in.
I don't think we are all irrational every time we fail to see through an argument in a book, but suppose it's true about you. You are still more rational than you think you are. You are irrational in a minor way - believing a misguided theory of the nature of rationality - but rational in a major way - you respond well to probabilistic evidence as you go through the day.