GoalKeeper05 wrote:
I literally just had a stranger walk up to me and say "your ass is fat as shit". 
 
Some people are just rude bullies. And you should never let them get away with it. Your response should have been "your face is uglier than shit."
It's like the old story where the woman tells the man "you really need to lose a few pounds." The man looks at her and says "madam, I will not always be fat. But you will always be ugly."