Hi! Vectored here by Robin who's thankfully trolling for new chumps and recommending initial items to read.

Aaahhh. Now I see. RobinZ.

I usually read 'Robin' as Robin Hanson from Overcoming Bias, the 'sister site' from the sidebar. That made me all sorts of confused when I saw that you first found us when you were talking to a biased crackpot.

Anyway, welcome to Lesswrong.com.

How can we disagree? 1+1=2. Can't that be extrapolated to many things?

Let's see:

• One of us is stupid.
• One of us doesn't respect the other (thinks they are stupid).
• One of us is lying (or withholding or otherwise distorting the evidence).
• One of doesn't trust the other (thinks they aren't being candid with evidence so cannot update on all that they say).
• One of us doesn't understand the other.
• The disagreement is not about facts (ie. normative judgments and political utterances).
• The process of disagreement is not about optimally seeking facts (ie. it is a ritualized social battle.)

Some combination of the above usually applies, where obviously I mean "at least one of us" in all cases. Of course, each of those dot points can be broken down into far more detail. There are dozens of posts here describing how "one of use could be stupid". In fact, you could also replace the final bullet point with the entire Overcoming Bias blog.