I think eating disorders are extremely common among women athletes, and because of that, the coach's comments and methods are simply inexcusable.

"Weight" per se is nearly irrelevant in a sport that isn't divided into weight classes, anyway. Did they measure your body composition? Do any measurements of power-to-weight ratio or upper vs. lower body strength?

I think it would be great for you to write the camp, with or without personal information. I don't think you're being over-sensitive in the slightest.