When I find "Group Identity" matters more to him than seeking to search DAD with open mind, I build a very poor impression of him.
Because he got no sane explanation for this behavior, I find he is irritated at my suggestion to find/assess DAD. He says I should not try to share my opinion of our DAD with him. This matter is closed for me. I am okay with Monkey form of DAD, Elephant fom of God and Snake form of DAD though I am a human being.
This behavior of brother is heart breaking. There can be nothing worse than a human treating "Identity" above DAD.