At the risk of sounding like one of those people at Mensa that annoyed you...
The people at Mensa aren't a valid sample of people who score high on IQ tests, because there is a such a strong selection effect for people with certain personality traits, such as wanting to join a club based on your IQ.
By looking at interactions of people in Mensa I feel like 2% of top IQ is actually too low bar to notice anything particular about "high" IQ people. We are still pretty random in our interests and performance.
Or, to put it as Groucho Marx did:
"Please accept my resignation, I don't want to belong to any club that would have me as a member".
https://www.youtube.com/watch?v=kJHUres_2xU&t=228s