In the words of Nas its cuz people fear what they dont understand and hate what they cant conquer. I have ran into this situation before too at work and even on the streets. They always say some dumb shyt too like why are you denying yourself from certain foods. I just hit them with some shyt like im not denying myself i just no how to control myself. I let em know that i still eat some of the things they do i just dont do it excessively and on the daily. Of course the typical fat persons response is usually some shyt like "this is how God wanted me to be". Then i hit em with some "no God didnt tell you to eat a whole pizza alone or a gallon of ice cream" you chose to do that on your own accord. From there either they walk off or we commence to arguing.