If I was able to go to an Arsenal game at the Emirates I'd want to embrace a little WWE [Wrestling] style and hold up a sign that that says [Joel] "Campbell Section" -- that's right: I'm a Joel Campbell Guy!
Basically, the ethos of being a "Joel Campbell Guy" is that you really hate Alex Oxlade-Chamberlain, not just because he's generally useless, but because he essentially got all of the opportunities that your guy Joel could/should have got. One day I stumbled across a cartoon caricature of Joel Campbell so I decided to load up photoshop and have a little fun with it:
There's not too much you can do when Arsene just doesn't rate you. *shrug*