Anyone who makes fun of people when they are there and aware, be it about bodyshaming or any disability, is just an insecure, pathetic excuse of a human being that has nothing else better to do. They say bullies have more problems than their victims, and thats probably true most of the time; they get that sense of relief when they release their anger on someone weaker than them. The best option is to leave them with their ignorance, it will never come to any good in the end; even if i don't believe in god, i do believe in karma. I've never been violent, despite being a big guy, but if i was i'd probably approach them like "well you know, my hands don't stutter, wanna have a go?"