This situation has ugly written all over it.
I don't know the kid in real life. He could have some sort of annoying kid that pissed everyone off around him, he could have been autistic, he could have been just fan of the show.
I'm not going to blame the victim, but I am going to say what he should have done from the start What I do know is that when you deal with a situation like this you don't feed bullies. Publically declaring yourself to be something is not a good idea. It's a tv show marketed toward young girls, announcing you are fan of that would be like announcing that you are into hardcore BDSM and inflation. People that hate you would just use that stuff against you. The kid should have stopped using facebook, or whatever social website, changed his online name, and kept that thing secret.
I don't if that was a automatically operated train or if a conductor was on board, but either the conductor or the emergency crews are going to have a hard time sleeping. Same with the family.
The saying of think before you say something definitely holds light here. Next time you guys want to post something, think about how people would react to it. Things like is it really worth mentioning this, or how would this affect my relationship with people, or how would my employer react to this if he or she saw this?