I was shown the joke by its butt. The t-shirt suggestion (see FoTW article) was mine.
I think the joke's as petty as Andrew wants to make it, which isn't very. His complaints on GNOME are relatively on-mark.
Me?
If I want to show a h4x0r a k3wl desktop, I point 'em at GNOME.
If I want to show a l0053r a friendly desktop, I point 'em at KDE.
If I want to get work done, I fire up WindowMaker.
My apps of choice: vim, mutt, and w3m for about 75% of my work. Galeon, AbiWord, Pan, and GIMP are from the GNOME camp. KOrganizer and a handful of games, from KDE.
I'm glad all of 'em exist, frankly. I'd like to see them interoperate smoothly.