It’s a symptom of relativism to be offended by simplicity and directness.
A human being is a unity of body and soul. The body is an integral part of a person’s humanity and reveals a person’s humanity. So a person’s humanity can be observed, grounded, and affirmed by…observation.
A mirror reflects human nature for those who are struggling. And other people reflect human nature as well. We derive meaning and identity from ourselves, but always in the context of others. The male body doesn’t make complete sense without the female body. We discover ourselves by observing others.
Even if the person is struggling with an issue of identification, dealing with a problem requires dealing with life as it is . This process of acceptance is unavoidable, and acceptance of reality is the only launching point for growth and change.
So the admonition to consult a mirror is wise, and is simple and direct.