Let's back up a few posts...
I had been focusing on his relationship status, not the entirety of his social existence.
Humans do require social contact with other humans. It's what makes us human. Without it, there's no exchange of ideas and no conflict. If our ideas are not challenged, we risk developing a habit of intellectual incest.
Like everything, it's about finding your center. You might be comfortable being sidelined from the turmoil of social politics. That's fine. But being isolated completely? Only the most jaded solipsist can withstand that.