Most people here would definitely know the song. The song itself has become incredibly popular, of course. But the phenomenon of trolling someone with a rick-roll would be too obscure for someone described as “very-much-not-online”.
So that’s the context I made my comment in. Internet culture is huge here, but it lives on the internet. But hey, in no way am I the decider on what is normal elsewhere.
I guess it would depend on where one’s from then. I don’t, as a northern European, have any clue what the Macy Day parade is. One needs to be a chronically online person to know what a rick roll is in my country, and I would call that phenomenon massively widespread in our online culture (well, back in the day). Someone being “very much not online” and at the same time being aware of Rick rolling is an oxymoron to me.