"He was warned not to do it, but he did it anyway. He showed no respect for the authorities."
This part doesn't ring true with me, and I suspect it's coloring people's view of the situation. The problem is that too many people have had experience with authorities who overstep their bounds and forbid or demand things when they have no right to do it. So, when they read the headline there are many who will consider the possibility that school officials are being excessive in trying to tell this student who he can ask to attend the prom with him. The public would have considered it a non-issue if the story had read, "Student suspended for disrupting a school function."
The problem I have with the situation, on the other hand, is that the student was disrespectful to Ms. Davulari herself, by turning what should have been a personal event into a spectacle. If he truly wished to ask her to attend, he could have found a dozen more polite and honorable ways to do it than calling her out in public while she was working. It's pretty obvious that he did it to aggrandize himself (and I sincerely doubt he'd have sought her out if she hadn't been the reigning Miss America), and I'd have been more than agreeable to seeing Ms. Davulari dress him down for treating her like an ornament to impress his friends rather than as a person worthy of respectful treatment.