If you give your child both of those, then making new friends can be greatly aided. Stepping in Generally, if your children seem to be getting along with their friends, you should leave well enough alone. The feeling that your child has made an inappropriate friendship is fairly common. Parents, though, should attempt to play the role of facilitator and guide rather than dictator. Going in too strongly against a friend can affect a child's sense of judgment later in life, causing the child to believe he is unable to make good decisions when it comes to trusting others.
Children judge themselves on the acceptance they receive.
So, it's best to help the child come to the realization that the friend may not be appropriate, rather than forcing that opinion on them. The best strategy is to help children make small leaps in understanding, allowing them to better learn how to self-diagnose their friendship difficulties. Ask them if they think it's appropriate behavior and why. Through slow, evolutionary guidance, you can give them the self-confidence to make their own decisions. And often, you won't have to do anything once they start examining the situation for themselves.