Ignore works just fine......
http://prntscr.com/66gxvi >
http://prntscr.com/66gy79 >
http://prntscr.com/66gyp9 Ignore disables all messages and shouts from the designated player.
Otherwise he can go into his Minecraft options and disable the chat.
Here's a tidbit for when you get back in four days: Ignore Creative players, especially non-ranks, who feel the need to bully you or others. Many players in Creative have gotten away with rude things and probably feel obligated to push that fake privilege in other peoples' faces. Of course, most players are decent, but you have bullies floating around and a lot of "jokingly" inappropriate players talking in Shout.
If you go back on and you're still having serious problems, message a Helper, Admin, Moderator, Owner or Builder immediately (at least one should be on in Creative). If someone is threatening to hack, ban, kick, mute, to do anything to you that only Staff members can otherwise do, or uses vulgar language, take screenshots and again contact a Staff member (if you must, screenshot your Minecraft chat log with the evidence). You're more likely to be bullied when Staff members are not online, so send screenshots to an active Forums Staff member (such as myself or Bob).