Being Critical Without Being A Jerk
Being critical and thinking critically are two different things.
Being critical is problem-focused. Dwelling on the issue or on the failure.
Thinking critically is solution-focused. How do we move forward despite the failure or shortcoming?
Being critical can play an important role in thinking critically. An honest postmortem can sometimes be invaluable. But you can't stop there. The key is pushing your mind forward towards a solution.