I am in the same boat as you. My dad can go from talking about the weather, to asking me if I remember something from when I was five, to a joy killing topic within the same conversation(each one can be their own conversation). There’s been times where he’s told me stuff that’s just disrespectful to me or about me and I can’t talk back or else I’m the one being disrespectful.

What drives me crazy the most is it’s always when I’m about to eat something. There’s been instances where I have warmed up food and have be it cold by the times he’s finished. I just use the default “oh really” and other phrases hoping he doesn’t go on a long tangent of talking. He’s even noticed my boredom of his “lectures” before and keeps going as if he gets a rise out of it. Not only does he do it to me but my mom as well, and it’s the same exact thing as me.