Yea this is absolutely rude to tell someone asking a valid question to go read the manual.
Because you're assuming that's how everyone can learn things.
But many many people have learning disabilities of different styles of learning (auditory, tactile, hands on, etc)
Reading a manual is often one of a person's weakest learning Method.
I personally have a high IQ but my attention span for reading a manual just isn't there anymore at my age. I ask friends, watch demos, research forums before going into a manual.
Some people are manual readers some are not.
I bring this up because this is a comment I see fairly often on forums from people that basically want to put other people down to lift themselves up.
This is a weak character trait often characteristic of the non-creative type, unemotional, or the old-fashioned conservative type
