Ok, this is a topic that I personally find myself talking about a lot. Matzy, I disagree on your last point. For some, it's not easily avoided. Weight has always been an issue in my family. I am, slightly obese. Fortunately, I don't fall under the people who are 400+ lbs, and have trouble walking without getting winded, but none the less, I can easily claim to be heavyset. Do to hormones and metabolism, there was no way for it to be "easily avoided" in my case. I do agree that obesity has no advantages, and that it's not beyond anyone to take steps to either correct or avoid it, but to claim that it's a simple issue is a narrow minded view. I've been eating better and exercising regularly, and hopefully one day, obesity won't be an issue for me, but for someone like me, the process is an incredibly slow one.
It's true that there are people blessed with speedy metabolisms, and that they manage to beat them and gain weight regardless, and I would also agree that frivolous lawsuits to places like McDonalds don't do obese people any credit, but not all obese people are like this. It's a stereotype like any other. People need to take a look at their prejudices against obese people, and see it as it is, a problem, a fixable problem, but one that isn't as clear cut as you would feel better believing.