Quick anecdote about computer illiteracy: There was a girl in my class and her family only got a computer at home a year earlier (her parents also only got around getting a tv around the year 2003 or something even though they are semi-rich. They were just very old fashioned like that).

Anyway, she thought every computer was unique in that they all have their own files and that's it, like a human reads a book and that knowledge can't be directly copied from a brain to another brain. She was actually pretty smart, had great grades, but this was all so alien to her.. Thing is, school didn't bother to teach a lot of computer stuff since it was already considered common knowledge. When we had our first ICT class we sorta laughed about how we were first taught the very basics everyone already knew, but it was all new for her. Ever since she was great at using computers, but the point is, if she hadn't chosen that class she might have still not know about simple things like copying files to another medium.

In the case of this guy, as it's the year 2017 I think I'm gonna go with either laziness or stupidity, but I just wanted to point out that there are a lot of people who could benefit a great deal if every school spends a few hours to point out some of that stuff. Maybe have them do a quick 15min test and if you fail you have to do a brief course the following week.