This is a fun response from this Ask Polly Q&A:
“Your in-laws are next-level, off-the-charts batshit.
Every now and then, a group of people assumes the traits and behaviors of sociopaths. Maybe one person in the group completely and permanently lost their doughnuts several decades prior, and slowly, each member of the group learns that playing along with this singular menace is the only way to survive. Eventually, the members of the group are so utterly confused and gaslit by each other that they enforce the will of the group and nod along with bizarre opinions until they can’t even remember what it means to think logically or have free will or behave like other regular human beings on the face of the planet.
Because these people are confused and weak and angry — and because they’re rendered increasingly more confused, weak, and angry by their exposure to each other — they tend to have less and less contact with those outside the group. And when they do encounter someone who’s not in the fold, they recoil and attack. Anyone who questions the group is attacked with words and actions. Anyone who questions the group is bad, and the group is good.”