My daughter is in Grade 2 at CAIS. She doesn't mention any bullying case and I didn't hear anything about the bullying or isolation of complaint parents from other parents.
As we don't know the details of the bullying cases, I think it depends on what had actually done by the students and whether the complaints make sense before we can make a conclusion.
I do know some students have to meet with Principle if they have behavior problems. I don't think the school would ignore if the bullying is serious.