You're right, the analogy was somewhat flawed because obesity is a self caused condition. A condition that can be overcome rather easily with strong enough willpower. A stammer on the other hand is a neurological and/or psychological ailment that even the strongest bouts of willpower are virtually powerless against. And I am rather offended that you don't consider a speech impediment a "real" handicap. Especially considering there was a kid who just posted that he had to quit his job because he could not communicate with customers. When something negatively affects your self worth, livelihood, and causes a plethora of other mental conditions then it's definitely real.