Earlier today my nephew was over at my house playing on my xbox 360. He had started out playing a baseball game but then decided to hop on to mw3. After a few minutes i hear him telling someone to leave him alone, and as i do not allow him to use the mic even though he is 10, i went in to see what was going on. There was a player on the other team shouting obscene things to my nephew, very vulgar and hateful things so i told him to just play campaign. After a minute we started recieving messages and despite me telling this player what the situation was that my nephew was 10, he kept sending vulgar messages. I have pictures of the last few messages he sent, and will gladly send them where they need to be sent.
Again, I have the pictures of the messages saved on my computer and I also have the Gamertag of the player saved as well.