Have a look at the way one of the world's top cryptographers, David Wagner, talks to the crazies on sci.crypt. It makes me tear my hair out sometimes - these people are rude and dismissive towards him, seeming to have no idea how fortunate they are that someone of his caliber has deigned to pay their ideas any attention at all, let alone the patient and helpful explanations of why they may not advance the art as much as they hope.

(at least, that was my experience many years ago - I haven't read it for a long time)