I'm extremely introvert and – as a student, not a neet! – I've lived the past months in a manner similar to that described by the article. I think no shut-in nor introvert gets satisfaction from such behaviour.
It's amazing how you're acutely aware to how every introvert feels about this, when did you manage to contact them all and convince them to respond to such a question? Otherwise, how can you make such an absolute assertion?
You could have used "some", "most", "many", "a sizable portion", etc, but you took an absolute term rather than a malleable term. It's not my fault you're unclear in your communication.
You shouldn't generalize people (doing it by race is called racism; doing it by country has no fancy name that I know of but it's wrong all the same), or refer to some cultures as "better" than others.