In the real world, genius is usually the product of obsession rather than some innate superiority. The best people in their fields aren't just super humans with superior minds, they just care about one specific thing in such a way that they are able to develop a level of mastery over it that few could hope to achieve. People might be born with aptitudes. Nobody is born a genius.
Being a genius doesn't mean that you're smarter than everybody else on every subject. It just means that you have one specific field where you're King Shit of Fuck Mountain.