<<Personally, I don't find posts spectacularly insightful if they contain sarcasm ("what are you doing picking her up from school ANYWAY?", "like most parents," sarcastic comments about how unrealistic it is to expect a child to do homework, etc.).>>
Either this person has solved the problem, or has experienced a raw nerve. Responding posts weren't necessarily "sarcastic," but rather an attempt to open the mind to see the entire picture. Quite frankly, some victims of emotinal abuse are suicidal, misdiagnosed as bipolar, improperly medicated, and actually seen as the "crazy" person. Only intensive family therapy/counseling will expose the roots of the child's behavior.