I'm sorry to say but ur little brother probably shouldn't be playing destiny if he's crying over getting booted. The internet is a rough place sadly and if u can't handle people being jerks u need to stay away from going onto multiplayer games/party chat. I'm not saying that it was in any way fine for that to happen and they should be rightfully punished for being jerks. I hope ur brother can find some nice people to take him through the fight again.