Comment by busterarm

I agree. Also there's one specific context where I use this quite a bit, even if it's a bit passive aggressive...:

When someone is asking me about something that is a) their job and b) I have explained to them before. There are a few specific people that I have to do this to repeatedly because for some reason they don't want to do the thing their team owns. It's a high noise source at my work and this response is my new version of RTFM.