Well, I don't think I'd be entirely happy with baldness ( the avatar isn't a million miles away from actuality), but I'd struggle to refer to it as a disability.
However, if my hair fell out tomorrow (unlikely, I'm 55 and still got it all), I suspect I would have considerable difficulty in coming to terms with it. Not to say I couldn't cope, but I really would not like it. I'd probably end up flaunting my baldness.