Culture shock stemming from a generation gap, I guess.
(Obviously this distinction is not important for most comments here on Hacker News which are just written in passing, but if this was an academical setting you would, presumably and hopefully, get laughed out of the room.)
Also the whole "don't use Wikipedia" thing is idiotic. There's a bunch of tech illiterate teachers who think Wikipedia is full of misinformation, and impress that view on students. So lots of people think Wikipedia is useless, while in reality it's a fantastic source of information and you can easily find the sources of that information.