Also, I know a number of overweight people who, to give an actual recent example, have trouble being treated for a sinus infection. They go to the doctor, say "I think I have a sinus infection," and the doctor refuses to even examine them, or examines them but doesn't do anything about the sinus infection (so, no antibiotics prescribed), but just gives the person advice on losing weight. Someone I know nearly died because of this, because she had to get pneumonia before the doctor would actually engage with the problem that was bringing her to the doctor in the first place. This kind of thing happens to overweight people all the time. Often not in so extreme circumstances, but I've known so many people who have this problem that it can't just be a problem with people I know.

Also, while people should be encouraged to maintain a healthy lifestyle, that won't help everyone who is overweight. It will help most, and that encouragement is vital whether it will help the person lose weight or not, but it's not just about weight. There are also plenty of people who are overweight for other reasons, such as already-existing medical conditions that they don't necessarily have the ability to affect directly, or as a side-effect of other medications (I know I have gained a fair amount of weight - almost 40 pounds - since I started taking certain medications, at the same time that I've been getting more exercise and eating healthier, and blood tests show that my cholesterol level is lower than it was when I weighed less). But people assume that I'm overweight because I'm lazy, or because I eat nothing but fried food, or whatnot. And I also get a lot of assumptions that my health problems are based on my weight, rather than, say, the chronic viral infection I have.