I have a memory of a sutta that explains that certain topics should not be discussed with certain people, depending on their character or qualities, because this might cause anger or other bad emotions in them. I have gone through the entire “speech” and “talk” chapters of the CIPS with no luck. Unfortunately I don’t remember enough details of the sutta to find a meaningful search phrase. Everything I’ve tried hasn’t led me anywhere.
I tried to search with things like “Can’t talk everything with everyone” or “certain topics should not be discussed with certain people”, but I couldn’t find anything.