Here is a video boogie2988 made that sheds some light on what it's like to be obese.
You shouldn't "shame" people just because they're fat. But you should "shame" stupid delusional people for spouting bullshit; the kind of people who promote ridiculous ideas such as "health at every size" and "fat is beautiful" just to justify their weight and repulsive eating habits because accepting those ideas is easier than proper diet and exercise. There is nothing healthy, glamorous, fun or attractive about being obese.
This is one of my favorite debates on the topic not only because the "plus size" model does a pitiful job defending her ideas but she died, shortly after this debate, at 36 years old even though she was "perfectly healthy". ha ha ha ha
Also, for those who blame genetics; your body can't defy the laws of thermodynamics. If you consume less calories than you "burn" your body will get smaller and if you consume more calories than you "burn" your body will get bigger. If your whole family is fat it's not genetics, it's tradition. You ate the same way your parents ate which is the same way their parents ate...