What you described however, sounds like maybe you meant compartmentalization. While one may be aware of what they are doing when they are doing this, how is it not a deception to ones self that the emotions they are compartmentalizing are not as valuable to their decisions?
Even average threes are fixated on their image and how they are perceived by others, although certainly not to the degree of an unhealthy three. When a person is fixated on their image however, they will continue to push undesirable parts of them to the side in order to present the proper image. How is this authentic?
I'll probably have more questions later...in addition to any questions that might come up from your answers.
EDIT: Another question: How on earth does a 3 mistype them self if they have not engaged in some kind of self-deception?