I met someone younger than me (~23 or so) who's a very bright intern, whom never used Microsoft Excel (after seeing this thread, I had to ask). They know what Google Sheets is, but know nothing of Excel.

You do know that there are tons of jobs that don't ever require interacting with spreadsheets, let alone a computer, right? This is exactly what I was talking about regarding how many HN users view the rest of the world.

>... or been to any kind of school.

"When am I going to need to use this?" is a common refrain for more than just attitudes towards math. I have met many people in professional environments who have no experience with it and don't even know what it is until you explicitly remind them what it is/does.