>Because as far as I can tell people mostly gain/lose energy based on whether they like the people they're interacting with
I was responding to this comment, which seemed to imply that introverts don't have a problem spending time with people they like. Or, at least, they don't have a problem with it any more than non-introverts.
I'm saying that's not the case (but it's possible I misunderstood what you were saying to begin with).