Can you really not see how dangerous this product could be, Mai? We are constantly bombarded with information telling us how dangerous it is to prop bottles in babies mouths, as it could lead to choking. Babies can choke quickly and silently. If a parent/carer isn't right there it can swiftly lead to tragedy. And yet this product does exactly what experts (ie the NHS) categorically tell us not to.
The fact is that pointing this out (in most cases politely, although some people were understandably upset) should not be considered bullying. What's the better scenario? That this product is sold, and a baby/babies die from choking, families are destroyed, the inventor is dragged through the press/sued etc and her life is ruined as well? Or she gets upset by people pointing out the obvious fact that her product is dangerous?
To be honest I think you'd have to be connected to this product or business somehow. No one else would value the hurt feelings of the inventor/business owner above the life of even one single child.