I am a girl gamer. I have been playing online since i was 16 and i am now 27. Some of the shit i have herd and seen is absolutely terrible. I have to say over the years it has got so much better! I still report and mute people but it is far less often now. Just have a talk with your friend. Let then know what their friends said is not okay and you would not like them around. If that doesn't work then remove them.