I don't think that it actually breaks down that way. In my experience both conservatives and liberals are composed 80% of people who can talk rationally with on

I don't think that it actually breaks down that way. In my experience both conservatives and liberals are composed 80% of people who can talk rationally with only their own side and 20% by who are prepared talk rationally with people from either side. You need to be a lot more knowledgeable about a subject to constructively discuss it with someone who disagrees with you. A big part of the problem, then, is that if you are not paying close enough attention it looks like your side is 100% reasonable and the other side is mostly unreasonable, regardless of which side you are on.