You may be looking for the word “neurotypicals”.
Growing up, I noticed that most of my groups of friends were groups of people where there was no expectancy of "being normal" (as we grew up, many of us ended up being diagnosed with different disorders, including things like autism).
Most of us lived in different neighbourhoods and went to different schools. Also, many of my friends _had_ no friends in school or their neighbourhoods. We tended to find each other and keep in touch with each other online (or things like SMS), and it's highly unlikely we would have found each other merely 50 years back.
In the past, people like us surely would have ended up relating with normies, mostly due to a lack of an alternative.
You say "it would mean that X" which makes one expect you'll mention some X that is implied by the hypothesis, but you're you're merely re-stating the assortative mating hypothesis.
"In societies where people do not have freedom to pursue their interests and passions, where meritorious education is not valued, where men and women do not have freedom to choose their careers, and where nonconformity is not tolerated"
I have a hard time seeing how these types of advancements would have such a drastic difference in mating habits.