Colleen, it's to bad our society has degraded to the point where people will go up to a complete stranger and make rude, hurtful, hateful things without any provocation....
You just have to consider the source and move on, clearly these types of people are lacking in some sort of mental capacity....
I would not resort to replying back in any kind of smart a**ed way to them, it just would make you look just like them.... and that's what you want to avoid