Quick Answer
Professionalism questions similar to AAMC PREview often test whether a response is reliable, respectful, accountable, and constructive. A strong response usually addresses the problem directly, avoids excuses, protects confidentiality when relevant, asks for guidance when the situation is beyond your role, and repairs harm when your actions affected someone else.
Weak responses often minimize the issue, shift blame, ignore team impact, retaliate, gossip, or take unilateral action when the situation calls for communication or supervision.
AAMC PREview is not asking whether you sound virtuous in the abstract. It asks you to rate specific actions as Very Ineffective, Ineffective, Effective, or Very Effective based on how well they handle the scenario.