[sachdevap]

I would suggest that your perception of his use of the phrase is just your perception. I have listened to him often, and never found him to be arrogant. He is not passively asserting that the listener is uninformed. He is just saying that the sources are abundant and easily available. Not to mention, he often cites people whose work he is referring to. If you are familiar with the work he is referring to, he is clearly not assigning homework to you. If you are not familiar, I don't see how it is arrogant to ask someone to familiarize themselves with a given perspective on the subject matter where sources are easily available.

And to assume that he does not have authority as an expert in a myriad of topics seems to be giving him little credit.