I kinda agree with Sarah.. yeah, it is annoying that some guys act like idiots...but just ignore them... if it's too much for you then maybe you shouldnt be on this kinda forum...
I've had more than my fare share of weirdos and even stalkers over the 7 or so years I've been on various forums... it's just one of those things unfortunately!
And I wouldnt say that it makes girls think that every guy is going to be a moron, you can generally tell just by the first message if he's going to be an idiot or not...