Aumanns Agreement Theorem suggests that rational folk shouldnt be able to continuously disagree…so why do we?
Agreeing to Disagree (Aumann, 1976) - http://www.ma.huji.ac.il/~raumann/pdf/Agreeing%20to%20Disagree.pdf (You might be intimidated to read the original paper, but its only 5 pages long!)
Are Disagreements Honest? (Cowen and Hanson, 2004) - http://mason.gmu.edu/~rhanson/deceive.pdf
The Influence of Social Interaction on Intuitions of Objectivity and Subjectivity (Fisher et al, 2016) - http://onlinelibrary.wiley.com/doi/10.1111/cogs.12380/full?wol1URL=/doi/10.1111/cogs.12380/fullandregionCode=US-NYandidentityKey=5df892a1-56cf-4803-9900-62e46db16887
Rationally Speaking, Episode 143 - Scott Aaronson on Aumanns Agreement Theorem (AAT) and its Implications - http://rationallyspeakingpodcast.org/show/rs143-scott-aaronson-on-the-theorem-that-proves-rationalists.html
Political Polarization in the American Public, by the Pew Research Center - http://www.people-press.org/2014/06/12/political-polarization-in-the-american-public/
Are Toxic Political Conversations Changing How We Feel about Objective Truth? (Fisher et al, 2018) - https://www.scientificamerican.com/article/are-toxic-political-conversations-changing-how-we-feel-about-objective-truth/
Lesswrongs entry on the AAT - https://wiki.lesswrong.com/wiki/Aumann%27s_agreement_theorem