The fact that some people are smart and some people are stupid is obvious to everyone. Every single human quality (strength, hair color, endurance, patience, height, immunity to diseases, penis size, etc.) follows some form of smooth distribution and we all agree on that. The claim that intelligence somehow doesn't because reasons is so blatantly false I don't understand why would we be discussing it in the first place. If you're a woman you ain't going to compete with men in MMA no matter how hard you train. It's extremely evident with children who innately display different skills. Also mentally disabled people exist and they prove that "everyone is equally innately smart" is false as fuck unless you don't consider mentally disabled people to be people - controversial position, but not exactly useless.

The issue here is that the society simply isn't ready for the logical implications of the fact that different people have different innate intelligence.