6 and 9 and "uniqueness"
Post from David Gray:
The online zeitgeist sense of Type 4 ('written' mainly by 6s and 9) refers significantly to a very universal human need/desire to be directly acknowledged for being a distinct and specially-regarded individual.
There's also a kind of 'chip on their shoulder,' in Types 6 and 9, about not having the right to fully claim uniqueness/specialness, as if outside forces (people) are somehow taking away (or have a claim on) their individuality. This is a projection inherent in these two personality types, that their personal power (some sizable portion of their individuality) lies partly somewhere outside themselves, with other people or the collective, in some way.
This is why so many 6s and 9s self-type as 4 -- such a self-typing is a statement (in the defiant sense of the word) / a previously unexpressed claim of individuality.
And this is why 6s and 9s can get stubborn about 'being a 4' -- because the superego of 6 and 9 both have 'rules' around how much individuality can be expressed, moment to moment, which builds up a large storehouse ('Shadow') of resentment around the non-expression of this basic human need -- and then erupts as a 'rebellion' (typing as a 4), which is ultimately a rebellion against their own Type-based superego restrictions.