It seems to me that often people are dangerously self-referential in their MBTI understanding.
What I mean by this is that as someone grows in self-awareness along with type-awareness, they seem to begin to intertwine what they know about themselves with their understanding of the type and attribute behaviors or processing that have nothing to do with MBTI as being necessary characteristics of the type.
I've noticed this same phenomenon with people who have close relationships with a member of a particular type (spouse, parent, best friend, etc). They seem to observe behaviors in this person (usually things that irritate them or that they don't like) and begin to either overlay the characteristics of the person they know on to the expression of everyone who claims that type or else conclude that those who don't exhibit a particular characteristic, but still claim the type, must be mistyped.
Anyone else noticed this? Any thoughts?