Was it poorly written? It was clear enough for you and many other people to write simulations, to do mathematical analysis, etc. Or could it be the case that some very accessible true facts in probability are counter-intuitive, but even after we're convinced that we were mistaken in our intuition, people will prefer to blame the problem?

Note, I think people sharing this kind of thing _do_ tend to be smug, but of course if the first time they heard it they were also confused, they have no reason to be smug.