@Idrake

Uuuuh apparently the author behind that theory has some interesting other ones.

https://www.washingtonpost.com/news/wonk/wp/2016/03/18/why-smart-people-are-better-off-with-fewer-friends/

“Kanazawa himself is no stranger to controversy. In 2011 he wrote a blog post for Psychology Today entitled "Why Are Black Women Less Physically Attractive Than Other Women?" The post ignited a firestorm of criticism and was swiftly taken down.”