A reader writes:
Really? Please realize that "retard" is a slur, which has somehow morphed into common usage much the same way "fag" was used years ago. Yet the pain it causes is real, to those who are intellectually disabled, as well as to their friends and families.
"Celebutard" is not really a neologism; it's been in popular use for at least three years (judging by its entry in the Urban Dictionary), and is actually a conflation of "celebrity", "debutante", and "retard" (or "leotard" if you follow Dan Savage's campaign), originally and most aptly applied to Paris Hilton.