https://www.lesswrong.com/posts/BkkwXtaTf5LvbA6HB/moral-error-and-moral-disagreement

When a paperclip maximizer and a pencil maximizer do different things, they are not disagreeing about anything, they are just different optimization processes.  You cannot detach should-ness from any specific criterion of should-ness and be left with a pure empty should-ness that the paperclip maximizer and pencil maximizer can be said to disagree about—unless you cover "disagreement" to include differences where two agents have nothing to say to each other.

But this would be an extreme position to take with respect to your fellow humans, and I recommend against doing so.  Even a psychopath would still be in a common moral reference frame with you, if, fully informed, they would decide to take a pill that would make them non-psychopaths.  If you told me that my ability to care about other people was neurologically damaged, and you offered me a pill to fix it, I would take it.  Now, perhaps some psychopaths would not be persuadable in-principle to take the pill that would, by our standards, "fix" them.  But I note the possibility to emphasize what an extreme statement it is to say of someone:

"We have nothing to argue about, we are only different optimization processes."

That should be reserved for paperclip maximizers, not used against humans whose arguments you don't like.

-Yudkowsky 2008, Moral Error and Moral Disagreement

Seems to me to imply that everybody has basically the same values, that it is rare for humans to have irreconcilable moral differences. Also seems to me to be unfortunately and horribly wrong.

As for retraction I don't know if he has changed his view on this, I only know it's part of the Metaethics sequence.

I could have sworn he said something in the sequences along the lines of "One might be tempted to say of our fellow humans, when arguing over morality, that they simply mean different things by morality and there is nothing factual to argue about, only an inevitable fight. This may be true of things like paperclip maximizers and alien minds. But it is not something that is true of our fellow humans."

Unfortunately I cannot find it right now as I don't remember the exact phrasing, but it stuck with me when I read it as obviously wrong. If anybody knows what quote I'm talking about please chime in.

Edit: Found it, see other reply

Links to the original 2004 article on intelligence.org seem to be broken...they are not even 404ing.