I was a bit surprised it wasn't on there already, right next to LMGTFY. But I can't think of any reason it would be appropriate to put RTFM in a post or comment.
It sounds good at first glance, until you get into the details...
As of now there are 97 posts containing rtfm. Among them I see:
- Someone asking for the manual
- Someone who answered his own question with the manual
- RTFM appearing in program output
- RTFM used as an example similar to foo and bar
- Someone stating that they read the manual
One thing I didn't see from my short spot check was misuse of "RTFM". Such things should be dealt with on a case-by-case basis, as they are now.
RTFM is (was) an actual product - It is entirely conceivable that we would encounter questions about this product (as a component of the relatively common RT ticketing system), and there are parts of RT that still refer to "RTFM" even though it's no longer a discrete product.
It would be rather unpleasant for us to turn around and tell someone they can't ask their question because the name of the product they're asking about is a bad word.
More broadly, I would rather not see us applying word-bans to correct bad behavior - If people are being dicks we have existing tools (peer pressure, edits, mod messages, suspensions, whomping shovels, personal responsibility) to deal with this, and I'm all for applying those tools liberally.
I think word bans should be saved for truly egregious problems (like LMGTFY), spam, etc.
Sorry but sometimes RFTM is the correct answer. We see far too many posts which would never have been required if the asker had simply done the right thing and read the documentation.
Instead of creating a blanket ban on the term shouldn't we instead simply close any questions where RTFM is given in either an answer or a comment? Don't treat the symptom. Treat the disease instead.