She will be 3 this month. She was angry at me bc I told her to stop pulling on the wrap while I was wrapping up the baby bc it was dangerous and might cause me to drop the baby. She kept doing it and eventually I picked up the wrap and the baby and went in another room and shut the door to finish wrapping up (took like 30 sec). She got mad and started screaming (she does this constantly, whenever she doesn't like something she has a screaming fit, which I generally handle by telling her I do not like to hear screaming and I am going in another room until she is done).
5 min later she went to the potty and yelled for me to help her clean up. I reminded her that since she needed me to do things that she asks for (like wash her bum) then she should also do things that I ask for (like stop pulling on the wrap when I tell her to). So she said "eat poop."
I was so horrified I really did not know how to react. I just said that was disgusting, nobody eats poop, and let it go, just finished cleaning her up and helped her wash her hands. But I certainly do not want to hear anything like that from her ever again and I can't think of how to get that across.