A standard response of adults is "why don't you stand up for yourself? Many times kids get picked on because they are a little timid and lack appropriate responses to attacks. However, sometimes targets of bullying do stand up for themselves.
Point out politely but assertively to the teacher who is accusing your child, "My child was bullied for months which is a breach of the school's duty of care as a consequence of which my child was forced to take action him/herself. This is a situation that no child should ever be placed in. When bullies receive a taste of their own medicine they immediately feign victimhood in a manner which is convincing enough for some people to be fooled. I now ask you to cease victimizing my child immediately and instead deal with the bullies. No one has a right to hurt my child.”
Mike Bogdanski M.S.
