My dad is like that. I feel for you. Obviously he is getting older and my mother is very ill. So I am not about to start trying to change him. We just don't engage in these debates. If there is no one to argue with he wouldn't go on for too long. Just tell him you have to make a phone call or go see someone or simply pay no attention. Or tell him it's not his business what you watch. Screw this. You should watch and read whatever you want! Don't let it bother you too much.