What's bothering me are the people who joined in in the discussion, especially the users who were absolutely too rude in saying whatever they said. This case isn't only interesting as an exemple of how fast and powerful Twitter is, to my opinion it's also a cry towards people who raise and educate children.
The main reason why kids spend time on the internet is communication. As interaction in the non-digital world has it's rules, obviously communication online has these same rules. But when people hide behind nicknames and avatars they can feel more free to do things they would never do when not on the web.
I really feel like a preacher when saying all this, but I mean it: if the future is to the youth, why not invest in teaching them how to behave online? Otherwise they may well grow into the same 'adults' who feel free to insult anyone who stick out their necks.