I would imagine it's because we are on the north side of the aisle and he is on the southside... northsiders are the cool kids, southsiders are, well, do I need to say it?
yes... on my side of the aisle we will be wearing cutoff jean jackets and will be yelling in fake accents. your side will be swilling pints and will be constantly asking for someone to explain how a guy can be "offsides" without a blue line. pick your poison.