D.M.
I ran into a similar problem with a friend who is raising her boys to be "tough, not wimps" As a result, her boys are bullies and are always picking fights. I just found excuses to keep the kids apart. When she finally questioned me, I was honest with per, but started with "My kids aren't angels" and pointed it out so she wouldnt take it I was attacking her kids.
He 6 year old beats up my 9 year old. When he has finally had enough and hit back, then her 11 year old goes after my son. To her, it was funny. I pointed it out to her when it happened and got her to stop, as her reaction was egging the situation on.
My kids are more important than the friendship, so if she chose to end it...so be it.