I'm sure some people can have a "disorder" involving body image and wanting to get bigger, but to imply that anyone who works out is doing that is not right.
There is definitely a way to take fitness too far. Sure, your physical health may be tremendous, but it can certainly take a toll on your mental health.
I agree though. Implying that anyone who is dedicated to fitness has some sort of disorder is absurd. It takes time and it becomes a big part of your life. I don't think that's unhealthy at all.