Why are all of my Sims CONSTANTLY being rude?

I haven't experienced that, but while I was playing one household my sim from another household who has a pristine reputation, friend of the world, and has never had a bad word to say to or about anyone, came around and picked a fight with her boyfriend's wife. She was really angry and I couldn't get her to calm down and it was completely out of character for her - the autonomous behaviour was all wrong.

Imo we need to be able to switch off negative interactions for certain sims - I'm tired of social menus full of "complain about" stuff for a sim who never complains, and when you're playing a different household your other sims should autonomously behave as they did when you were playing them.