What we judge or find repulsive in others often represents a "shadow" part of ourselves that we haven't fully accepted or integrated.
Understanding that others suffer from the same insecurities as we do can lead to deeper compassion and more conscious relating. Other People's Mirrors
It sounds like you're referencing the concept that , reflecting back parts of our own psyche, insecurities, or suppressed traits. This idea is a staple in spiritual and psychological circles, often used to turn interpersonal conflicts into opportunities for self-reflection. What we judge or find repulsive in others
Were you referring to the of people as mirrors, or did you just finish watching the 2004 film ? Other People's Mirrors