Earlier quoted context omitted.
"move far away, live simply, and take up a hobby" Why not just live among people and make friends with people in the same income bracket or assets or higher?
That's a possibility too. I was thinking it would be more difficult, since he might have run into the whole new rich/old rich thing. He would have been perfectly happy living in a suburban tract home, and that's the type of person he grew up with, so I was thinking that would be the easiest. Besides, you have fewer choices if your pool of potential friends is rich people.
How many friends does someone need?
I don't see any evidence that wealthy people or upper middle class have any problems friend wise.
Not only that but nothing prevents them from mingling with anyone even a lower "status" if you want to call it that.