Is it because they're not really smart and they try to learn things from youtube rather than reading?
Skeptic
A community for Scientific Skepticism:
Scientific skepticism or rational skepticism, sometimes referred to as skeptical inquiry, is a position in which one questions the veracity of claims lacking empirical evidence.
Do not confuse this with General Skepticism, Philosophical Skepticism, or Denialism.
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"A wise man proportions his belief to the evidence." -David Hume
Not a bad guess. The moving picture medium has been around for a while though and complements the written word, rather than supplant it, as a tool for learning.
You want to learn how to get a garbage disposal unstuck?
Watch a YouTube video.
You want to learn to learn about psychological concepts in 25 minutes by watching a video?
Cool, it won't ever work but I respect your wishes.
But no smart person would believe just watching a quick video is actually learning anything more advanced then: there's a place for an Allen key under the disposal