If someone is fat pointing out so is not an issue for me. I am short, it is a fact, I have no problem with it being stated. If someone is bald, pointing it out is not an issue. Pointing it out is different than making fun of it but I hate the PC police telling me that stating my opinion is wrong. I do find Kelly Clarkson a bit pudgy, maybe not fat, but pudgy.
Generally speaking Americans are much fatter than most. I spend time in Europe last year and it was startling how thinner the population was over there. I was on a cycling trip and everyone on the trip noticed it.
I don't make fun of weight and am all for helping anyone looking to lose it but if you are unhappy about how you look the reason is in the mirror, not in society. It is not hard to get information as to what is a healthy lifestyle, it is out there and easier to access now than it ever was. If you choose to make poor food choices than don't be surprised if you are called out on it. Yes, everyone has to eat but everyone doesn't have to eat cake or fried Twinkies, eat fruit and vegetables and lean meat. Making healthy choices is easier now than ever, just get the willpower.
No one had any busy "calling" someone on being overweight, it is NONE of their business, anymore than someone following you around and making nasty comments about your height. And btw, you can help that, they have a surgery overseas that makes you taller.

I gained a lot of weight with the death of my daughter and the worry of losing my other daughter the first few months of her life. I turned to food for comfort and was not exercising and was very depressed. A couple of years ago I lost forty pounds by exercising and eating healthy and then my daughter was hit with two surgeries including heart surgery and the other emergency. I returned to emotional eating, binging really and gained the forty pounds back. I am back on the bandwagon and trying to make running my bad habit instead of binging. It is a work in progress, but regardless of the reason for my weight gain, no one has the right to make derogatory comments to me, EVER.
Also, will power is a small part of it and it is beyond ignorant for you to be so dismissive of another person's problem. One could say the same thing about alcoholism or drugs or whatever and it would just be ignorant.
And another thing, it is not as easy to get information, there is a lot of MISinformation in what is healthy and not healthy. Eat carbs, don't eat carbs, eat protein, dont eat protein, stay away from corn syrup, corn syrup is okay, on and on and on. Unless you have walked in another's shoes and know for a fact the issues they face, don't belittle and simplify something you know nothing about.