If someone posts something about Bitcoin, and you feel you have a valid counter point that nullifies what they have said, and you would like them to be able to see where it is you are coming from, then insulting them is not going to help. If you start off with a common ground, slowly lead away from there using what you view to be sound logic and ultimately arrive at you view, then you stand a much better chance of having them be able to understand your view. As soon as most people feel they have been insulted they switch to attack mode and healthy dialogue goes right out the window.
Agreed, and I think most people do this. The trolls are the real problem here.