Husband's always right

My DH is 80 years old. We've been married over fifty years. More and more, he can get very nasty towards me. He can go on and on about different topics and if I finally try to say something, he'll say I am butting in and not letting him speak. This is often after he has gone on for fifteen minutes or longer non-stop. If I point out how he has spoken to me, he says I'm starting a fight.
Does anyone else have to cope with something like this?