A screenshot of the comments began circulating this week.
Former student Matthew DeMarco started an online petition, calling on the school district to fire the teachers involved.
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"I know the teacher, I know who it is - I've had her, my siblings have all had her. We know what kind of person she is - she is very considerate, very compassionate towards others," said DeMarco, "And so as soon as I saw these comments being made about her, I was outraged.
The district says it has 'zero tolerance for such reprehensible behavior.'
The incident is being investigated.
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