IQ score doesn't make people exceptional, genius or gifted. What people DO, what they CONTRIBUTE does. But today it has become and identity, a desired trait in a manner almost that counters physical attarctiveness.
It is funny when you think, actually from an angle this gross high IQ culture is a reaction to the value soicety automatically gives to physical attractiveness.
Being seen as an highly intelligent, gifted individual is today very different than being physically attractive or rich as the 'winner' conditions go. You can get rich, you can get handsome or beautiful or sexy...and you can improve your intelligence of course, BUT you cannot become 'gifted' or a 'genius'. The basic idea is that you are either born 'gifted' or a 'genius' or you just don't have what it takes.
So this is actually not so much different than our Japense friend's sentiments of entitlement(s) of his 'superior' race in a way in its root. Having a personal trait that cannot be gained by hard work or cannot be bought by others doesn't matter how rich they are, but just can be possessed by birth; by being; having it naturally.
But of course again reality is very different. For someone -even wth a high or a monstorus IQ score- to make a real contribution, there are so many other factors involved...basically from just dumb luck to what kind of an environment they were born into or raised -again pretty much luck- to extreme hard work. That's what makes people a genius. Not having a high IQ.
There is literally a very little amount of people with exceptional potentials of intelligence in the world. And that is not limited with being good at math and natural sciences either. The most famous one, Albert Einstein is a genius because of what he accomplished, not because he had a high IQ. He was also born in to the 'right' place at the 'right' time. Had the 'right' gender. And most importantly had the will and the drive for that hard work; solving what is in front o fhim. Also he highly likely developed that genius on the way when he is splitting his brain with that potential.
Through out human history, tons of people with exceptional potentials died in mud doing something very stupid, a duty they were put by their soveriegn. Or sometimes had the wrong gender, was born in the wrong place.