RTFM long predates videos in the internet; at this point I'd actually call it inclusive of videos and guides.
I actually get pretty pissed off when the only guide for a feature beyond a couple lines of "here's what this can do" with no elaboration is just a video. I don't want a video. I want a damn manual with working examples.
But if its all there is, I'll watch it before asking questions. The same should go for people who prefer videos, they should at least try the manual first, or looking at some guides or videos.
What's frustrating for people (generically speaking) is when zero attempt is made in advance of posting questions, and from what I see, is the majority of "RTFM" responses.