He's living in denial. As a gamer, you need to have self-respect and keep your desk clean; I know, everyone should have a clean desk but especially gamers, that sometimes sit between 4-10 hours per weekend day playing, need to be able to sit ergonomically and with hands able to move freely, instead of constricting yourself within the confines of your junk. If stuff pile up to the left and right of my monitor, I get slowly more and more irritable and uncomfortable until I've moved all the shit away.
I have one friend that I seldom visit in his home, because I can't sit in his sofa filled with papers, electrical cords, chargers, and cans, and try to have a good time eating junk food or watching a movie when his GIANT sofa table is filled from edge to edge with pure crap!
Clean out the desk, vacuum it, wipe down with wet dishcloth, blow out the keyboard with an air compressor, and wipe off the mouse with alcohol, and then rejoice at the fresh, comfy, and loose feeling of your empty desk/couch table.