I never said you lied. I am saying you're sharing a version of the story that is most favorable to you. I would suspect that the parent is telling his buddies a very different version of the story, I don't have any way of knowing whether your version is even close to what actually happened.
Bottom line, I don't know enough about what happened to know where things went haywire, but based on the way you're reacting to even a little push back in this thread, I can only imagine what you were like when this guy you admit you already didn't think highly of challenged your authority in the school.