How else could one go about typing a person through text? We associate the behaviours we read about with particular elements it is associated with. And when we happen to identify with certain behaviours, we point it out. Sure, the functions may be incorrectly associated with the subject's own behaviour, and this is probably inevitable. But it is all we can do to assist- by pointing out the plausible options from the self-description and describing our experiences and interpretations as we know it. It is up to the subject to decide on his own which makes the most sense as applied to him, because after all he knows himself better than we do.