I definitely think that there's been a shift towards seeing introversion as the deeper, more intelligent type of person and that some people are very annoying and smug about this.
I agree. Mumsnet has loads of threads from introverts who are saying how much they enjoy lockdown, and insinuate that people who can't cope with the isolation somehow have something wrong with them.
There are also many threads from "introverted" posters who never answer the phone or doorbell because their time is so much more important than anyone else's. That's not to say that there aren't people with genuine anxiety about talking to other people, but these threads are usually about how dare someone want to talk to them or see them without a written invitation three weeks in advance.
There is nothing wrong with being an introvert. I am married to one, but I dislike that too many people use the term to excuse what is just plain rude behaviour. And how extroverts are seen as loud, and arrogant and completely lacking in empathy.
My introvert husband is quiet and doesn't like being with lots of people. He doesn't "do" small talk and can be pretty antisocial at times, but he is confident and assertive when the occasion arises. He does answer the phone and the front door 
Like the OP I would say I am borderline, but veering slightly on the extrovert side. I am sociable, and sometimes find DH's lack of wanting to be sociable with other people rather stifling.