What is cynicism and how does it relate to psychological defense mechanisms?

Cynicism is described as a form of psychological defense that involves devaluing things through logic and rationalization. It serves as a barrier to protect oneself from emotional pain by making things seem less valuable or important. This can manifest in interpersonal relationships where one person dismisses the feelings of another, often as a way to shield themselves from vulnerability. The speaker emphasizes that while cynicism may provide temporary relief, it does not eliminate the underlying emotional pain or unresolved conflicts.