It actually makes a lot of sense that they are the whiniest, most sensitive, and always angry.  I mean, if I had to carry myself around on my back 24/7 I'd be pretty pissed all the time too.  I can't even imagine how much of a miserable existence that would be.  Some of these fats are carrying 3x or more an adult human's weight around at all times.  Like fucking wut?