"Since when can't school officials regulate that ? In my county and the neighboring county, the public school prom rules are (and I'm paraphrasing)"You and your prom date must be current studenta in good standing in this county. You must get the principal's permission to bring a date from another county; your date must also be a current student in their respective county.You may not have missed more than x-amount of school days this school year. You cannot attend prom if you have been sent to the alternative school or been in in school suspension (for more than x-amount of days), been suspended for more than x-days or are expelled." This was partly due to the classes before mine where a Marine & a cocktail waitress were students' dates at a 9th grade dance."
I never said they can't regulate it, my point is that many have experiences of school officals overstepping their bounds in what is reasonable to regulate, and therefore when something like this comes up in the context of respecting school officials, it colors the perception of the reader who is left to wonder whether they were doing it for a reasonable cause. To give you the perfect retort in kind, I don't think the restrictions you list are very reasonable, because they specifically exclude homeschooled students as prom dates for no good reason in addition to the perfectly reasonable question why only students are allowed to attend the prom. And that right there is why "He showed no respect for the authorities" is a bad way to approach what happened here.
"So, yes, he was being disrespectful to the school authorities, which is why I feel absolutely no sympathy for him."
It's a red herring (because the punishment doesn't need to deal with disrespect of the school staff to work, just the "disruptive" part) but it also allows people to sidestep the real issue, which is that he was disrepectful to Ms. Davulari. Any punishment that doesn't incorporate pointing that out to him is IMO misdirected, because that was at the center of the issue. He was disruptive and disrespectful to a visitor to the school during a school function just as much as asking any visitor overly personal or inappropriate questions, and if the school had been more careful to make it plain that the punishment was due to disrupting a school function rather than him asking someone to attend the prom with him, they wouldn't be dealing with the backlash of badly informed or biased discussion.