Both parties seem to be guilty here of not thinking before they act and of bullying, but it all starts with the prefect. (If the kids don't want to listen to the prefect, that's their problem -- it doesn't justify the prefect going Super Saiyan on them.)
The prefect is in the wrong for intimidating students and putting his hands on them. If he's acting like that at this age, regardless of disorders, he should probably go to anger management counselling or something because it's coming close to a point where he's going to have to integrate with the real world. He will never hold a job acting like that. This should also teach him not to have outbursts in front of the camera. ...and, I don't think someone this unstable should be a prefect.
The uploader is morally wrong for exploiting the prefect's outburst for humor, on the internet, no less, where people have a field day with raging autistics. Once it's out there, you can not take it back. "I didn't know" is not going to stop it. That kid will have to endure even more grief as a result.
All that aside, that remix was pretty rad.