The best leaders correct privately and celebrate publicly.

Correction in front of others adds humiliation to a message that only needed to contain information, and the humiliation is what gets remembered. Praise in private is heard by one person, praise in public tells everyone what is valued. The asymmetry is simple and consistently ignored.

Before giving hard feedback, ask whether anyone else needs to be present. Usually nobody does. Before giving good feedback, ask who else should hear it, and say it where they can.