Let's cut to the chase here. A forum with total agreement on everything would not be very productive. The purpose is to post things and get points and counterpoints. Sometimes we get fired up when someone disagrees with our thinking. This should either make you feel stronger about your position or question it more.
Rudeness is another thing though. It is no different than having a face to face converstation. Just because a person is hiding behind a computer screen, doesn't give them the right to belittle another member.
The third point, and maybe the most important thing around here lately, is that are people, (or groups of people) that attack forums for the sole purpose of disrupting them and causing chaos. We have to recognize this when it is happening and do the appropriate actions. Hats off to the mods btw.
If you are not aware of what I am talking about you can click on the following link.
http://en.wikipedia.org/wiki/Smurf_attack