Partly in some people, but imho, ask a handful of people with obesity about their eating and exercise habits (and their psychological state etc) and do the maths.

Self-control, also, might be partly genetic[1]. Regardless, both obesity and self-control are influenced by environmental factors, so it's a noble effort that Rob is trying to do something about it.

[1]http://cjb.sagepub.com/content/36/1/41.short

Even, say, tendencies to sociopathy and violence are also partially genetic - if you have a genetic propensity towards obesity, it doesn't reduce your responsibility by a single inch, it simply means that you have to pay more attention and seriousness to avoid mangling your life.

Genes don't feed your face.

Neither does cold-blooded logic. Nobody can understand obesity unless they've had to ask themselves "wait, why did I eat all that?" Willpower seems to be finite and its relationship to blood sugar may be genetic. I've had pretty good luck losing weight using protein/fiber shakes between small meals to reduce blood sugar spikes and blunt cravings that were hard to control otherwise.

Enough of this. We should fight the acceptance of obesity and externalizing blame.

You alone are responsible for your weight, health, and life.

Yes and no. There is a thin line to walk here. On the one hand, there is a definitely harmful component to the fat acceptance movement as you point out. On the other hand, discrimination and humiliation of obese people is wrong and counterproductive.

But the fact is that there are some people for whom obesity is actually a medical problem that has nothing to do with self-control, and a statement like the one in the TFA demonstrates considerable privilege blindness.