Yes, but I suspect it is far more common (I have no evidence to supply however) than the grandparent comment appears to imply.
We (the HN crowd) can easily get caught in a 'bubble' where because we known the details, and those with whom we typically associate also know the details, that we extrapolate those observations to conclude that "most people" know the details.
But until one's been in a situation of providing support or training for a diverse user group, one does not see just how little technical knowledge the "average joe" (a set of which we the HN crowd are very much not a member of) has of these things. The "average joe"'s level of technical knowledge is astonishingly low compared to the HN crowd's level of the same.
