Dd 's teacher approached me this morning at school and asked to have a quick word. Dd is 7. She told me that a parent in my daughters class had complained that their daughter had come home from school and used the one finger sign. Apparently my daughter taught it to her! I'm not that surprised as she has 2 older brothers and although we don't tolerate rudeness kids will be kids. The parent was waiting close by to see my reaction and approached us to join in conversation. The teacher said she asked my daughter if she had use this sign and she admitted she had but her brother had told her it was rude and she shouldn't do it any more. I think the parent was wanting for an apology but I'm afraid I said that I will make sure she knows it's rude but these things happen. I'm really annoyed that this parent has complained as a child in an older class taught my dd the c word when she was in reception but it certainly never crossed my mind to complain. AIBU?