You’re looking for straightforward “shooting the messenger”. While it’s true that it can be straightforward deflection of negative feelings about the scenario to the person who made them aware of it, I think you’re still discounting that a lot of the time, the majority IMO, people shoot the messenger so that they stop getting messages. Stop telling me your colleague is stealing paperclips so I can pretend I don’t know. Stop reminding me I have homework to do because I’m trying to forget it.