My own personal experience is that introversion is seen as a defect and many people have not minded telling me so right to my face during the course of my life.
I agree. In my experience my introversion has been attributed to being actually mute, to being abused or neglected as a child (I wasn't) to potentially being a serial killer in the making. And yes, I would call it a majority of people (and in more than one country even, both eastern and western).
For me it is not my Nness (people have both called me both a "dreamer" and "too practical"). The majority people seem to have the opinion that there is something "not quite right" about me. Don't know if that can be associated to any MBTI trait though.
For me. I would say it is my impulsiveness, and messiness that is another thing that almost everyone thinks is wrong with me. I suppose you can call this my "P". Still, I don't have a problem with decisiveness, though perfectionism and a bit of procrastination are issues.
Another thing that was disliked in general (but tolerate only in "technical" situations) is be being "nerdy". No non-nerdy kids were stuffed in lockers, had their heads flushed, or their faces smothered in piss.
Let's face it, there are certain personalities people (in general) like, and there are others people (in general) just tolerate at best.
It can be hard to find the people who like, say INxx's, or IxxPs for who they are. Generally, these people's lives are filled with criticism. To point of having nearly every conversation being about their "issues". One time I had 5 different people, in back to back, unrelated, conversations/lectures tell me what "my problem" was. I am sure that wasn't the record, but was the only time I kept track.
It has been the same three things all my life, and if I could still be me while changing these things I would have.
So maybe I am defective. Most people seem to think so.