kind of hard to have a conversation if you're not listening to what other people are saying. You know, you speak they listen - they speak you listen - you respond to their points they listen - they respond to your points while you listen...
If you're not doing that, then you're walking into a room, demanding everyone look at you, making a statement and walking out again.
Fair enough if all you want to do is make an announcement to an audience and leave, but not so good if you want to get an idea of a situation and discuss it or at least give an opinion that takes into account everything already said.