To be quite frank, my chief objection was that expressions like "such-and-such is a disease" have been cover for prejudices in the past - for example, regarding homosexuality. But more to the point, race is seen as an intrinsic property of the person which cannot be eliminated even if the actual markers of race are eliminated (witness the one-sixteenth rules) - which would make it a genetic disorder which can only be managed, not eliminated. A "blackness" which is treatable is so different from the modern, Western sociological phenomenon we call "race" that it doesn't make sense to talk about it.
So it's a poor example that makes people uncomfortable, in sum.
There was some talk here about height taxes, but there's a better solution - redefine shortness as a treatable condition and use HGH to cure it. They even got FDA on board with that, at least for 1.2% shortest people.
Unsatisfactory sexual performance became a treatable condition with Viagra. Depression and hyperactivity became treatable conditions with SSRIs. Being ugly is already almost considered a treatable condition, at least one can get that impression from cosmetic surgery ads. Being overweight is universally considered an illness, even though we don't have too many effective treatment options (surgery is unpopular, and effective drugs like fen-phen and ECA are not officially prescribed any more). If we ever figure out how to increase IQ, you can be certain low IQ will be considered a treatable condition too. Almost everything undesirable gets redefined as an illness as soon as an effective way to fix it is developed.
I welcome these changes. Yes, redefining large parts of normal human variability as illness is a lie, but if that's what society needs to work around its taboos against human enhancement, so be it.