Clearly depends on the situation and boss but often very negative in my experience, which won’t surprise anyone. In particular if the way you call this out makes your boss look foolish to their peers they will blame you (as I have discovered to my great chagrin). So discretion is often important and sometimes in some companies you have to just suck it up and do the thing because you’ve been told to. That might be a good cue to start polishing up your CV and calling recruiters though.