I was just PM'ing someone about the exact same issue (i.e. people being typetards).
A lot a folks associate a certain type with self worth (lol, stupid) and get severely butt hurt when someone suggests another type. Many others plain don't know wtf they are talking about. Also cognitive functions is so fucking vague and voodoo like that any slight variations in mood or style of talking can be "successfully" argued as an attribute of a specific type.
But my dear OP, you better shut your whore mouth about Kiersey. That man is a saint, despite his (oh so subtle) flaws.