This morning I very calmly and gently explained to my 4-year-old that when he places a cup down on our glass coffee table he needs to be gentle. His response: “It’s not fragile! You are the dumbest mommy. I am not talking to you ever! I am going to double spit at you…” And this is not atypical—he explodes like this on a regular basis, whenever we need to correct him or set a limit, or when he can’t do something perfectly right away. When we try to reason with him he shuts down—he’ll often just cover his ears or run away.  Help!