At my daughter's 8th birthday party, about 16 girls were seated along a huge table, painting crafts. While I was helping the girls at one end of the table, my husband was down at the other end. After the party, he told me that one of the little girls uttered the f-word in a normal tone, after spilling a bit of paint on her artwork. My husband said that when he looked over to where the word came from, all the girls around her were staring at her with that, "I cannot believe you just said that/you are going to get into big trouble" look. My husband then scooted over next to her, made her look into his eyes, and he firmly told her that her choice of words was unacceptable. And, if she used that word again at the party, he would call her mother to come and get her.
This child is the daughter of (this I found out later that evening) a very well-known surgeon, who was on trial in our area after being accused of raping several of his patients. His wife has stood by him, although with a mouth like the one on their eight year old, it's easy for the mind to wander and wonder what that home has been like during the midst of their legal proceedings.
Sad and disgusting.
How tagic for that child.
But the reaction of the other children, coupled with the story of her family life lends credence to my theory of parental fault for a child's language or lack of.