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Ok, I'll be that guy. No, at least not entirely. There are things most everyone will agree are irrational, for example going off looking for the edge of the earth, or looking for an analytic solution to the general quintic. Since there are things (almost) all of us consider irrational, rationality must be at least intersubjective. If I believe the earth to be flat, and so that there is an edge of the earth to be found, I may think I am rational in going looking for it, but I am wrong; I should know better.