This indicates a high degree of disagreeableness, which is a dimension of personality according to the Big Five theory. Extremes of personality often (if negative) indicate a personality disorder. The quintessential disorder for this, though, would be narcissistic personality disorder because the pathological narcissist is most heavily vested in being perceived by others (and thus reflecting back his or her desired self-image) as perfect, infallible, knowledgeable—you get the idea. Other personality disorders correlate with disagreeableness too, though, and reasoning for such emotional arguing could be slightly different at the psychodynamic level. For example, the archetypal patient with paranoid personality disorder often becomes hostile when others disagree with him or her. In this case, it's less of his or her being exposed to unwanted knowledge of his or her imperfection (as with the narcissist) but instead more of an easily triggered suspicious about others' motives: The paranoiac may think that another person's correcting him or her is an attempt to humiliate or some other projected manifestation of hostility.