I like to just go along with it, and get them to teach me. Accept the idea that they are the expert, and place them into a teacher position. If you disagree with a statement being made, don't be adversarial, steelman their arguments and try get them to explain to you why they are making the statement they are making. Either you ignite their passion, or they avoid you because you are weirdly too enthusiastic about a mechanism they may have been using to overpower you.

I had an math professor (NOT the one I am referencing in another comment) that was ego-centric and would often respond to my incessant questioning with demoralizing (and sometimes flat out rude) responses. I just acted completely oblivious to the social faux pas and his avoidance/adversarial tendencies eventually turned into a much more productive relationship. I received the only A in the class (he publicly posted everyone's grades).