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If this is new behavior, and especially if one of them has possible dementia or other new impairments, perhaps you could help by gently offering information to the other about the impairment and how to deal with it. Don't get into lecture mode or scolding, but share information.
Years ago, while my friend went through a 7 year final illness (at age 50!) one couple's negativity accelerated constantly while they were with her. She shared with me how much this bothered her. I reminded her she didn't have to spend time with them and the negativity wasn't helping her. She did kind of cut them off in the last year. Her only mention of it was that she was sorry she had to do it but it was better for her. The couple did come to the services, never wondered why they had been cut off. Sometimes these folks are so caught up in their own habits, they have no clue as to the effect on others.
Remove yourself from the sniping. Leave the house/room/discussion.