Re: If somebody does not understand...
The big problems are intolerance and lack of imagination on the part of the instructor. Since I first used a computer (1958 - I think; it was an English Electric Deuce - derived from a design by Alan Turing) - I have on occasion had to try to teach younger people how to use a slide rule in case their electronics stuff failed to operate. Great problems - until I realised that they had no idea what logarithms were!.
Apart from my family, I associate mainly with farts - some even older than me. Very few of them could not be trusted to vote wisely. A lot of them a very computer literate.