When I was a kid I noticed that my grandparents used to argue all the time.
I quickly figured out that they both made a very simple mistake—they were both convinced they had perfect memory and the other person had a faulty memory.
The best way to end an argument about the past is for either partner to plead senior lack of memory (even if they _know_ the other person is wrong).
It works!
Also, my wife has that "hard-of-hearing" problem wherein you can't hear anything said that you really really disagree with... Fortunately we have no disagreements about the problem of the communist infestation in this Nation...
IAC, after 60-years, she already knows what I'm going to say by the time I get the 2nd word out...