I once had a bus driver who told me that if my children were not"ready" to go to school, maybe I should think about spending more time "AT HOME" with them. This was at the point of early intervention and it was difficult sending my babies to school at 3 yo as it was. So yeah, not the right thing for anyone to say to me.
Another thing that is hard to hear is when my parents tell me that, "All you need to do is assert some discipline in your home." :-/ okay, if you say so Dad.