Unfortunately I don't have an answer because it has happened to me a lot too, not much as a child but more in my adult life with insecure people at work. I think there's something in our past or in us that makes us a target. When I was a child I used to fight back and answer. As an adult I expect (even though I try to change this belief) to behave nicely, in a mature and respectful way and when it doesn't happen "oh my it hurts.." To be honest I think these people target where they feel a weakness and we have to try to not let them walk other us. One thing I have noticed is that when I slept well and feel good I deal more easily with this type of behaviour and show them how low or pathetic they are.