>>632353pussy!
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I'm just kidding, the caveman stereotype is non-existent. There was no such thing as a "caveman". While some cultures post-flood used stone tools, no one at any point was really stupid.
People are more stupid today due to genetic deterioration, especially after the population boom of the 20th century (harmful mutations compounding). What we observe is animals lose genetic information over time, not gain it. This is a scientific fact, it's observable, verifiable, and repeatable, and it goes against the core principle of evolution (requiring net gain of genetic information over time, it does not matter that in some cases deletion of genetic code can result in improved outcomes, because overall going from single-celled organism to all life on Earth requires massive genetic gain).