Assuming the PM is true, even with all the valid points stated against it, I would connect the bullying to the boys social reclusivness rather than his interest in BIONICLE. From my experience, people only ever bully someone if they find that person annoying or hostile in any way. It 'is' possible to have an independent hobby and not be excessively ridiculed for it, even in American and British schools which are more stereotypical that way.
If, however, it was just because he likes BIONICLE, then I guess those people havn't yet learned not to judge someone by physical properties. Hopefully, they will in the future, in which case they would regret assaulting BF606's brother.
I agree with Omi though, a broken collar bone and scarred face does sound excessive, regardless of being true or not.