You make it sounds like he choose to be insecure about it.

It's social conditioning and ego doing it's thing to create pointless suffering/insecurity as usual. Nothing new. It will keep creating suffering for pointless things. The dna % just one of the mere labels it uses.

I wouldn't exactly say anything implies it is rare. 400,000,000 million people possess any particular trait at a greater prevalence than 95% of all people. It's more common than being an American.