I have no idea what sleeveless was setting up his question with but it sounded like Gaiman's answer to him (along with the impatiently waiting line of minions looking to impress with cleverly worded questions) was something heard by the entire applauding audience as: "go dress up and make some crazy magical YouTube videos".
That was nowhere near the nerdiest question ever. The nerdiest question ever would have had something to do with some character who was only ever seen standing in the background of page six, panel three of Sandman issue 27, who the questioner had written nineteen fanfics about and was in love with.