One way to set an example would be to invite one of you child's friends for milk and cookies or tea and biscuits. Let the mother in on your plan and then make sure the two of you greet one another politely. You and your child should have already discussed all of the correct manners for the hour or so that your guests will be with you. Manage coats, show them where to wash their hands, if the children are boys let them hold the chairs for the moms. Allow your child to serve the cookies and if age appropriate the milk. Have napkins already on the table. Involve each person in conversation. Your child will enjoy the interaction and will quickly start talking to his friend. If things begin to get out of hand calmly speak to the children and say, we don't treat friends that way. See, _________ and I aren't doing that. Let's try to be nicer, OK? Don't expect the children to sit still for more than the time it takes to eat their cookies and then allow them to play within sight for a while. Do this several times with different children and your little one will begin to understand. It can take until a child is out of school before they truly learn to value friendships and treat others as they want to be treated; but, you have noticed a problem and that and your willingness to do something will make a difference
Mom of 3, grandmother of 7, great grandmother of 1, fosterparent, girlscout leader and day care provider.