I think it's a matter of personal investment, it sounds like this guy got a below average score on an IQ test so now it's a mattter of personal pride that IQ cannot be measured. Likewise someone who gets a high score will be invested in the idea that intelligence is measurable, because it's something they're proud of.
This is why identity politics is so pernicious, it's soo easy to buy into the idea that everything wrong with your life is someone else's fault.
People can have stress or they can guess at random or many things that put them where they don't actually fit. What conclusion I came to was that these tests cannot be right because statistically it is like a coin flip. Not accurate at all. But brain waves do make things more objective.
The problem is that can you admit that objectivity even exists when it's explained to you. This guy is not even dumb or stupid but the school he came from was poor and SAT score was low but then he has more money than me and can do way more shit than I can but he no longer believes in objectively.
I studied these tests, I know why they work or don't he is not wrong about everything. But I have showed how and why with reasoning. All he can do is say, read these books and they prove via anti racism brains don't have anything to do with cognition.
It's religion 100%
Anything against ones religious beliefs mustn't be true. You must compartmentalize what is true and what is not otherwise you don't have a consistent view of reality.
We spend billions and billions of dollars on neuroscience and genetics. But because he reads books that use philosophy and all that stuff based on 1970s research that disproves Richard Dawkins. Then all modern science is debunked.
This works on people.
They change words to mean stuff that not true. But some people buy it. Because again religion. A cult works because you can get people to believe things based on authority telling them what's true. Read book X it's the truth. Everyone who says the opposite are bad people. Bla bla real science isn't true because 1960s failed science bla bla.
The real problem is that people cannot be objective. They are followers. This is why politics is the way it is. Not blue hair.