GP clearly believes it, since they wrote this. I believe it too, and I think this is a mainstream belief, not a "more than naive" one. Your one anecdote based on a Reddit rant (and, I assume, personal bias) is not nearly convincing enough to change my mind.
My anecdote, such as it is, is hardly uncommon. It is in fact, nearly a cliche at this point, or a stereotype. I sincerely doubt that me having communicated it to you is your first encounter with the idea.
As to your mind, I don't wish to change it. I am content with you remaining naive. My own children receive advantage from this. Please continue to screw up the public education system for decades, my entire lineage can only prosper the longer this continues.