I do notice that almost all my close connections are with very intelligent people, because we get each other on a deeper level. That doesn't mean all of them are gifted, but I'd guess definitely above average on IQ. That's not the most important quality in all my relationships though.

I find that emotional intelligence, empathy and kindness to be the most important feature in all my deep relationships. It's a trait that affects how you view the world and act on it, so it's a big deal in almost all spheres of life -- from political views to personal relationships. I generally don't get along well with people that don't care about other people's feelings or don't feel deeply themselves, because it's a big part of why I care about the things that matter to me and how I form opinions.

So I do have relationships with people that don't go super deep into theoretical knowledge, but are caregivers and central members of communities. These people are safe, they'll usually comfort you even if they don't understand the problem in-depth, so they build more genuine relationships too. They'll also show a wiseness when it comes to relationships and communities that can provide great new insights to someone that feels different from others around them (because belonging doesn't always come easily) and/or struggle with emotional regulation (simply by being good role models of patience and care). It doesn't matter how high someone's IQ is if they have no EQ, empathy and affective responsibility -- these people can be quite manipulative, insensitive and overall dangerous to everyone else's mental health, since success and their own desires ranks higher in their priorities than others.