Is it any better than your taking of a small problem and enlarging it to fit a larger population to achieve a socially deterministic outcome? I'm not saying that it doesn't exist, but in vanishingly small numbers of cases. The rest is just a bunch of twinks and fatasses trying to feel better about what they see in the mirror.
Oh, and here are a few obligatory

No, its not better, but when youre waking up at 3am to go to the gym, missing school and work, ignoring your wife/children/friends, and spending your savings on steroids/supplements, and youre life is going down the shitter, all in the name of "getting big," then, yes, its a huge problem.
The issue is that nothing is diagnosed as a disorder unless it interferes with various domains of functioning. For any behavior to be diagnosed as a disorder, it must "cause clinically significant distress or impairment in social, occupational, or other important areas of functioning." You're sort of missing that VERY important piece. Obviously, I would not expect you to know this small nuance when diagnosing a disorder. But its an important part in whether someone will be diagnosed with Body Dysmorphic Disorder. Nonetheless, someone can have traces of BDD without actually being diagnosed with it.
But, when all is said and done, yes, I do believe that BDD is just spouted off, without people really understanding the fine nuances of it. Is it real? Absolutely. Is it an overhyped saying? Absolutely.
