To ‘cc’ or not to ‘cc’ criticism?

Question: “Recently I received an email from a manager reprimanding me for some work I’d done that was ‘not the best use of your time.’ He pointed to other projects that would be ‘a better use’ of my time. What upset me was that he also cc’d my direct supervisor. It was demoralizing. What happened to approaching someone directly with criticism? Now I don’t trust this manager. Has this happened to anyone else?” —Deflated by a cc