Rude high school administrators... how unsurprising.
If you have emails, especially from people other than the person that said "how dare you," that were positive, go to those people and speak to them. If the "how dare you" came in email form, keep a copy with you. Don't be angry, but tell others you meet with that you got a "very negative response" from such-and-such, and then show them the email. If it isn't an email, hopefully they will take your word for it.
You could also quietly plead "I'm being demonized here." But not too loudly, more in disbelieving kind of way that says 'I can't believe an adult would act like that.'


