Kind-of tangentially related, but I find that there's a high tendency for people to interrupt other people and speak over others. This often leads to poorly-thought-out discussions, because people are rushing to get a word in edge-wise. At one point, I had to implement a "Lord of the Flies" style conch system to make discussions bearable. Lately, it seems endemic to programming style discussions. I'm not sure why.

I find that when everyone slows down, thinks before speaking, and uses deliberate language, understanding improves greatly.