"if you'r so -called friends urge you to do anything you know to be wrong , you be the one to make a stand for the right ,even if you stand alone.Have the moral courage to be light for others to follow" -Thomas s.monson 

 what he is trying to say, is that when you see that your "friends"are doing something you know its wrong. You should stand up. It doesn't matter if they are making fun of you.But the thing is you are making them standing up for the right thing to do.You may be the only one standing up for them but you be the leader of making people do the same thing like standing up for other.Most important you will be the one choosing the right.Also you have the courage to light up for others to follow.  For example if you'r "friend" is making fun of a kid you should stand up and say to Stop.And it doesn't matter if you are the only one standing up up you know you did the right thing.