Have to take it with a grain of salt, but if the people I’ve met who say they’re in Mensa are representative, then Mensa is basically a club for high functioning autistics.
That's a fairly accurate evaluation. I've met a few Mensa members.
My IQ is 146, but I have no need for Mensa, as I meet plenty of high-IQ people at work and have lots of smart friends. This is the case for most well-rounded high-IQ people.