A lot of introverts are quite likely to be somewhere on the autism spectrum.

For example, I can't unconsciously read expressions. I scored worse than blind guessing on the "Reading the Mind in the Eyes Test". So I consciously learned to read and mimic expressions, literally using a textbook for theater performers. So now I can score at the upper range of neurotypical people.

Other introverts often have problems recognizing social cues or initiating conversations. Purely because it's not _natural_ for them, even though they might _want_ to actually speak to people.

So is it kind of performative? Yes. But think about this, extroverts are doing a lot of same tricks subconsciously. Does it mean that they're _always_ performing?