I'm high-IQ, and have no problems meeting similarly smart people without need of Mensa. Most smart people meet similarly-smart people in college, work, or by living in affluent neighborhoods next to other high achievers.
From what I've seen of the Mensa members, many seem to be high-IQ people who are dysfunctional in some way.
“From what I’ve seen of the Mensa members, many seem to be high-IQ people who are dysfunctional in some way.”
I agree with that. I know of one member who had less than the best social skills. It seems when a person excels in one area they are lacking in another area.