If you say that someone is not a rocket scientist, you mean that they are not very intelligent:
Scientist
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One learned in science; a scientific investigator; one devotedto scientific study; a savant. [Recent]
Scientist meaning & definition 1 of Scientist.
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A (sometimes) brilliant person who dedicates huge amounts of time, thought and money to writing a research paper but is somehow unable to make this research paper comprehensible to any other member of the human race.
Scientist meaning & definition 2 of Scientist.
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According to [Hollywood], a person wearing a white apron and glasses, who can accomplish any scientific or technological task in a relatively short period of time.
Scientist meaning & definition 3 of Scientist.
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A free-thinking idividual that applies rules of logic, reason and experimentation to see how the world works, i.e a type of philosopher.
Scientist meaning & definition 4 of Scientist.
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A person who is able to use the words [horrifying] and [fascinating] in the same sentence, [unironically].
Scientist meaning & definition 5 of Scientist.
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an individual who aplies the realms of [mathematics] and the sciences to do things that are [difficule] without ever knowing why. a scientist will never care about [science] ever benefiting humanity, only advancing science for the sake of science
Scientist meaning & definition 6 of Scientist.