I mean it’s not a great joke. Maybe joke isn’t even the right word. They were just being facetious. At most it elicited a “heh” under my breath. But I’ll try to explain it…
The initial comment it was replying to was exaggerating for comic effect. Obviously the chart doesn’t mean people in those areas can’t form human relationships (or whatever it said).
The next person considers themselves an introvert, so they took the previous exaggeration, and being facetious, they quipped that they knew they liked it for a reason. That reason being that it’s a place with introverts. Like themselves.
We know that the exaggeration was obvious, so we know that the reply was attempting to play off of that.
If the joke were funny, explaining it like this would have ruined it. It’s not funny so I had no problem explaining it lol
Edit: It has become clear to me that I should never have entered this conversation and I regret it.
Oh for fuck sake, I’m out. Why the fuck am I still even in this conversation this is the most ridiculous thing I’ve ever been a part of. I guess that’s what I get for trying to explain a joke to someone.