I have to agree. I would have done the same thing if I was the sys admin at your school. If anything, I commend the sys admins for catching this security incident and taking action. In addition, I wouldn't necessarily consider them dumbasses if they're keeping you out of their network.

Also, it is probably not up to the sys admins as to what platform they use. Those types of decisions usually go way above their heads. Anyways, the point is moot since they're not going to listen to the guy that tried to hack their network. Not being rude, just stating the facts.