I would say, "I've had enough of politics lately, Dad. Can we change the subject?"
and then I would enjoy quality time with my father.
DUmmies seem hellbent to ostracize themselves from family who merely disagree with them.
My surviving family are nearly all flaming liberals. We get along fine. Leaving out politics doesn't diminish our time together, it enhances it.
I'm guessing his dad was trying to reach a prodigal son. Pity. no_hypocrisy was lost long ago when he replaced God with govt.