Certainly not the brightest approach. Granted, telling anyone, "hey I think your kids fat, it's your fault," can't really go over that we'll, regardless of how much tact you employ and good-natured intent you may claim you're acting with. It's one thing to be concerned, it's another thing to attempt to raise someone else's children, or reprimand parenting when you have no insight into that person's life. And to do so so publicly in a way that could be considered negligent considering the status quo among youth... I don't think she was trying to be helpful. I think she was trying to be hurtful, shocking, daring. And perhaps thought that'd be the best way to express her views. Illegal, no. Unethical, yes. Cruel, definitely.