That seems presumptuous to me. As most of us here are introverts and all of us are forum users, it could be more easily argued that we are the ones lacking proper real life social integration. By contrast, otherkin not only have forums but also have real life conventions and groups. This would be an additional source of socialization that would in no way preclude involvement in any other social involvements.
The us/them thing frequently tries to imagine that "those people" are so alien that they must live somewhere else like Austin or Portland.
But like LGBT and most other things we define as subculture, they walk among you. They are your coworkers, your waiters, accountants, and employers. On the weekend, some people play frisbee and some hang out with fellow otherkin. You would find that there are many who define thems es as otherkin, furry, bdsm, and gay. People who belong to all of these groups still have day jobs but are better networked than you may realize.
I had a friend who considered himself a member of all of those groups who hung out with me while visiting Dallas. He travels often and has friends in many major cities around the world. So what brought him to Dallas that time? A bear convention, of course. He was planning to catch up with a number of friends and make new ones. To meet him, you would just think he was an exceptionally intelligent nice guy with a beard, because he is.