Aww I am so sorry this stupid moron was horrible. ((Hugs))

I don't have much advice. But could you not just leave? Like walk out the glass.

You don't have to listen to people negative talk.
And surely a good teacher would know what's happening with you and be able to see if some one is pushing you to your limits.

Grr it makes me angry that no one has stood up for you.
Please try to keep yourself safe.
Massive ((hugs)) xx