Someone is threatening to dox me and my duo, who do I report this to

Title, I have screen shot of him saying he would after the game. In game he said "please ff" I said "just because you said to, no" then he asked in all chat for everyone to report me I said "Yous a lil bich" then he proceeded to complain the rest of the game at trivial stuf contacted me after the game and said "I'm going todox both you :)" then started saying how he's going to get me kicked out of school and how I threatened to kill him. None of which occured.

I won't lie, I asked him to do it over and over again asking him where I went to shcool. He returned no results after 45 minutes and started demanding my skype and email and twitter. He's full of shit, but he' s making threats like this.