I'm a proponent of RTFM, (real documentation has a lot more thought put into it then some random response you would get on IRC or a mailing list, and it's rude to ignore the effort the documentation author put into real documentation) but I always link the user to the appropriate documentation instead of just telling them off.
If you want to support that, a good first step would be to improve TFM, because much of it is far too dense to actually read. Technical writing, knowing how to summarize things through human knowledge,, is a critical skill for tech businesses, and most open-source programmers lack it.