There's an important difference between criticizing a person and criticizing someone's work. The work can be iterated on and improved through additional effort

There's an important difference between criticizing a person and criticizing someone's work. The work can be iterated on and improved through additional effort. If your criticism comes off as being directed at the person it can have very demotivational effects. Also, not everyone is looking out for the subtlety of where the criticism is directed. So it's best to make the distinction clear.