No, "Mama joke" jokes. The point being that joking about kclug.org being run on IIS is roughly equivalent to "Yo mama" jokes.
"Yo mama so stupid she think 'Kernel Panic' be in the Croatian Army."
Might as well mock someone's religion: "EMACS is teh sux0r!" "Open Sores is an abomination unto Stallman Almighty!", etc.