I'd make a "print a pdf" joke, but honestly, that's already an unnecessary "skill".
Sadly, technology has moved towards single finger usability and thrown out features in the process. Printing a PDF is now easy, because there's a big button (that sells you a cloud subscription for some reason), but it's also the only thing the app does.
Yet its still a surprise to many. But I suppose that's a knowledge gap not a skill issue.
Now getting younger folks these day to follow a file directory, that's a true challenge.
PDFs are designed to be printed, that's why they're formatted as pages instead of continuous text like HTML. "Portable Document Format". Unless I'm missing some reference you're making here.
The joke to counter "you can't even write cursive" and other boomer bs is "well at least I know how to print a PDF", alluding to the abysmal tech intuition of some boomers, usually those in controlling roles like managers or CEOs.