My comparing GID with "RID" was being facetious, for those who didn't catch that. I agree with Miniar it is comparing apples and oranges- I for one am very comfortable in my fairy-ness, and do not see it as a disorder at all. In fact I see it as a distinct advantage, and I'm quite proud of it. Contrary to the Peter Pan/Tinkerbell mythos, fairies really don't care if humans believe in us or not. It's their loss.
Perhaps it is merely a psychological coping mechanism, for those who feel outside the norm, or disenfranchised by the rest of a faceless society they can live neither within nor without. But to equate it at all with a "disorder" like GID is missing the entire point of it, in my actually rather studied opinion on the matter. Missing the entire point (ie, comparing apples and oranges) is something some people do with distressing frequency.