To respond to part of that comment

I would expect that both you and Will would see the light on this if you spent some more time probing the thought processes of people of "normal" intelligence in detail, e.g. by teaching them mathematics (in a setting where they were obliged to seriously attempt to learn it, such as a college course; and where you were an authority figure, such as the instructor of such a course).

I might be pretty strongly wired not to get this concept, because I spent several semesters teaching in college, and most of the time when someone can't seem to "get it", I just assume that this isn't what they're good at, but they must be great at something else.

Despite this, I'm still skeptical. I'm not sure that I will ever get over that, but I can try to modify my behavior to circumvent that overestimation.