A player by the name of Mau5GoneMADYT has been cyber bullying me for about the past 30 minutes to an hour. He's told me something like "Gavin, you should just go kill yourself.", and something like "I can code very strong malware," and "I can blow your router up kid." He's been denying it for a while as well as some of the admins, but my friends and I all saw him say it. If you don't believe me (which you probably don't), go check the chat-logs. There is proof in there, and I am more than sure that he's been saying disrespectful things to me. I currently don't have any screenshots, but I think the chat-logs will do just fine.
If this is true, you should try to screenshot it, because otherwise there really is not much proof. This behavior isn't tolerated, and if you can provide proof, I'm sure he will be punished.
off topic: i bet that kid doesn't even know how to ddos or code on topic: Screenshot your game whenever he starts bullying you again (Windows: F2 ; Mac: FN+F2), and upload the screenshot (located in %appdata%/Roaming/.minecraft/screenshots) to imgur and post the image on the forums.