OP, I'll share a story with you that will make you see how these things can get very twisted.
There was a boy in DS1's class at his old school who one day attacked the class teacher on the playground, using a stick, his hands and his feet on her. She was quite bruised after it and very upset.
The boy's Mum went into the school (when her son was excluded for three days) and kicked up a holy stink. She moved her son to another school and has since done nothing but slam the school and bitch about the teacher. She wouldn't believe her son had behaved like this. And - here's the kicker - people agreed with her.
Me, I saw the whole episode. It was right before home time and they were all heading back to class after time on the field. I raised the alarm with another teacher and had someone come to deal with the situation. The boy's Mum was not on the premises at the time and did not witness what happened at all.
And yet, as I say, she has since denied the whole thing, despite me and many others witnessing it ourselves.
According to her the school hated her son.
Now imagine if you met her, with no prior knowledge of the incident, and she told you how the school hated her son and accused him of violence towards his teacher who was a bitch.
It's easily done.