When I think back to my super model days, I remember that I had to have a thick skin. If you had the wrong eye color, wrong hair color, wrong weight, Big hands, small feet, large nose, small ears, freckles, pimples or whatever and it wasn't what the casting agent was searching for . . . you were just WRONG. And they were harsh about it.
Okay, I was never really a super model. However, that is the general reputation that industry has.