It is known as a false dichotomy, and it is extremely common. A true dichotomy would be more along the lines of: he is right or he is wrong. Of course all pos

It is known as a false dichotomy, and it is extremely common. A true dichotomy would be more along the lines of: he is right or he is wrong. Of course all possibilities subdivide, if he is wrong he is knowingly wrong and a liar or he made mistakes and too grandiose claims. Even if he is right, he could be right for the wrong reasons: his conclusions could be unsupported by his premises & evidence but still correct.