I too am mystified. Most new posters are beginning or returning to cycling and I see this subforum as being uniformly encouraging to them. When I post in the 41, I am a little more aggressive, because, well, that's the 41. Maybe the debates here get a little dogmatic when we move to issues like nutrition (low carb diets, for example) or topics such as "will a more expensive bike make me faster?" I dunno. Even those threads strike me as pretty polite.

I really wasn't aware that there is a problem.