I don't think it's more. I'd happily argue 80% of people keep to themselves 80% of the time, but those 20% gaps are highly visible in contrast.

But to the point: What's the socialite's internal monologue while being all chatty? What's the overlap between what they think is happening (e.g. what the script is, what the norms are) and what third parties would see?

I see social people who obviously feel connected to the group, but how much of that is just eating up their own internal version of what they see happening while ignoring the smell of any mentally suppressed interactions?