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The truth is the truth. High IQ people can be better at providing good, very well formulated series of statements leading from one major true idea to another one, but low IQ people are capable of grasping upon very simple truths too, even if they aren't capable of deriving much from them.
Since the vast majority of people aren't high IQ, and there is a negative stigma around being low IQ, it's easy to find people who feel offended by being dismissed as "dumb", or as "not very good at thinking" (because it's not exactly something one may easily prove to be wrong), which is why, whenever a speaker's intelligence is brought up as a possible interference in regards to what they might be able to state, they might altogether dismiss its influence, if only for the sake of not being kept off the field of discussion due to it.
As stated before, even though a low IQ person might be capable of recognizing something as true (or can be taught that something is true), they might not be able to spin it very well, which is why they might rely on psychologically manipulative tactics (which may present themselves in the form of namecalling their opponent or dismissing them due to motives unrelated to the discussion) to make others feel like what they say holds much power.
A high IQ person informed on a certain subject might be capable of doing reasonable guesses, but might also resort to the same tactics as a low IQ person might, if they happen to feel like it's not worth fighting a battle against another person who might not even be capable of understanding what they might try to explain (or if they flat-out have no respect for them).
t. midwit who feels like he can talk about everything, but will only hit the bull's eye 1/5 of the time