Thread got closed as I predicted, so a quick reply in regard to your post:
No, it works both ways, actually. He should learn not to just throw around insults so easily like that (and his parents might need to learn that autism doesn't mean he doesn't need to be disciplined, but who knows on that one), and his sister needs to not take it so hard in turn. The world is not so idealistic that she'll never be insulted again in her life, whether or not it's by her brother, and in the end something EVERYONE needs to learn is to pick and choose battles and things to get worked up or upset over.
The fact she made a thread about it means she hasn't yet. Don't paint me as the villain just because I'm saying what everyone else isn't while they proceed to only give her the more pleasant half of what she needs to hear.