"What makes a proposition true is that society believes it to be true. Hence, whenever individuals disagree about the truth of a proposition, what they must disagree only about is whether their society believes it or not."
How would you resist this argument, based our approach in this course on logic?
As individuals belong to different societies with different systems of beliefs, so the truth of a proposition should be established by something other than mere social agreement. Correspondence is with the world is a great alternative.
As individuals change their own opinion in time, so do communities. Truth should then change based on the dynamics of what societies agree upon.
Science is not the right place to look for ultimate epistemic standards.
Brains are the result of evolution in an environment governed by laws of nature, which are logical in some respect.