But you expressed doubt of stated (and frankly not even remotely subjective) experience, so if we dropped you in an organisation your immediate response to anything you don't understand is "That doesn't match my mental model, so I doubt it actually happened", followed by either everyone giving up or you insisting everyone persuade you of absolutely every last detail of everything. It's enormously tedious, and the reason it comes across as arrogant is the demands put on everyone else to explain everything to you because you clearly see everyone else as incapable of the same level of insights that you are, all the while you are telling people what they experience is them being mistaken.
Just look at the way you questioned whether or not I could tell if someone is actually smart or not. It's just plain insulting. And it's not just me, it's everyone that has this same experience which forms the basis of the stereotype.