To you.
That doesn't mean D&D isn't designed in a certain direction. You can employ the system (however awkwardly) to accomplish whatever you may like, including traipsing off through fairy rings, but that doesn't mean the game doesn't have a core and a focus.
If you find interacting with little people more interesting than exploring dungeons and slaying monsters, that's cool. Use D&D or don't use D&D; it really doesn't matter. You'll enjoy your game, and we'll enjoy ours. Finding insult in the statement of a designer who was simply pointing out what the game is designed to best accomplish is just silly, though.