Not intelligence in the generic sense. It’s referring to the usage with regards to intelligence quotient, or the standardized testing of intelligence, not the common usage.
Implies born-intelligence, an innate trait that is fixed which also implies the flipside, that people who do not have this quality of “intelligence” are born without it, as an innate unintelligence that is fixed and unchangeable.
Expressing a strata of cognitively fit and cognitively unfit is ableist. You might not like that fact, but it is.
Being unable / unwilling to self-criticize is considered a sign of less intelligence, at least social intelligence, somewhat negating a claim of intelligence, at least of a certain kind.
You’re not an idiot. But “When in Rome” is a universal truism.
If I got into a store and decide the prices are too high, can I decide to pay less money or pay in seashells? Maybe in some places.