Brave of you to tackle this group of girls. It's all a question of how they are brought up by their parents or significant others. Parents are the role models and although peers are very powerful in forcing norms of behaviour, if parents have brought their children up to be polite, then rudeness to others, especially those more senior, will not come easily. I have a friend whose daughter allows her two year old to run riot, pushing and kicking everyone and everything in her way. The child takes temper tantrums at the drop of a hat and the mother does nothing apart from cajole the child to behave. It wins every time. I'm not advocating a slap on the hand but there are ways of teaching young children what is and what isn't acceptable. Recently, in my home this child opened a drawer pulled out a knife, threw it on the floor and then slammed the door closed. The mother did nothing other than issue a wimpish 'oh that's not nice'. The child repeated the action with another drawer, again no reprimand. This time I told my friend's daughter that if the child did that again I would chastise her and was told to 'go ahead'. The child promptly opened a cupboard having been told by me not to do that, and in sheer defiance pulled out a box of washing powder and threw it on the floor. I shouted loudly at her, took her hand and marched her out into my back garden where I left her to stamp her feet. The mother was clearly uncomfortable but I told her that if she didn't make a stand now the child would become a dreadful teenager with no respect for anyone. Eventually the child stopped banging its head against my patio door, stopped kicking it, and just sat and looked at us all. I opened the door, let her in and said quite firmly that if she went into any of my drawers or cupboards again I would put her back into the garden and she would not come in until it was time to go home. She behaved. Most behaviour is learned behaviour and as adults, especially older ones, we have a duty to indicate to younger parents whether they are managing the parenting properly. I'm sure lots of people will tell me I should mind my own business but when it's in your backyard, it's perfectly appropriate to expect children to work to your rules.