I don't like stereotypes, but in a lot of them there is a kernel of truth.
...and for many people (not all) , fat goes together with lazy.
Too lazy to work.
Too lazy to exercise.
Too lazy to cook for themselves.
So, there are poor folks, who are too lazy to take any job to keep food on the table. They are too lazy to cook, so they buy fast food or microwave dinners full of starch, fat, additives and low-quality meats. They get fat (or fatter) from eating these foods, and so the food is to blame - not the lazy lifestyle that the person lives that makes getting fat easy.. No-no-no.. Can't blame yourself, can you ? Always someone else's fault...
Again, thats not everybody, some are genetically predisposed to put on pounds, and they have to work extra hard to keep it off - hell, I could lose more myself... but I digress..