Individuals who refer to themselves in the third person often do so as a means of exaggerating how "big" (important or famous) they are according to Esquire. Doing so gives a person a feeling of power, and of separating the "I" from "he" or "she."
Another reason that an individual may refer to himself in the third person is because he has suddenly achieved fame in some way, and he is trying to get used to that fact. It is a means of enlarging oneself to fit into a role that has been assigned to the person. When one refers to himself in the third person it is typically in an "end of argument" type of way that does not invite questions.