Warning, weight stuff.

I posted that I wish women didn't think their weight was an indicator of their self worth, and a friend replied that "being overweight is unhealthy for the body and the mind." I do not get this thinking at all. As a fellow woman, I thought this person would understand what I was trying to get at, but instead they think the fat is the cause of everything, like everyone else does ... I'm sad now. Am I overreacting?