William, I'm a fan of yours, really. I love your stuff. But you jumped off a cliff on this one.
Your analysis of flawed reporting about the study you cited is correct, but your conclusion that stigma will help is a leap of faith. Nothing in the study supports that conclusion.
I've seen no studies anywhere that support that conclusion. Have you?
What really happens when you direct hatred towards obese people? When you shun them, fire them, refuse to hire them, insult them, attack them, abuse them? Does it motivate them to become thin?
What it does is depress the hell out of them. Quite a lot of them turn to food as the only fleeting source of comfort remaining to them.
My take on this study is this: social influences do matter. If you hang out with guys who routinely wolf a box of doughnuts, you may say "why not?" And wolf your own. People can be influenced socially into altering behavior. But this mechanism is "reinforcement," or "encouragement," not "stigmatization." There's no way to conclude that stigma will produce the reverse effect.
If you've seen any studies which show a positive correlation between stigmatization and weight loss, I'll eat my words. If you haven't, take it back, William. Your treatment is worse than the disease.