Moral relativism all the way. I mean something by morality, but it might not be exactly the same as what you mean.
Of course, moral relativism doesn't single out anything (like changing other people) that you shouldn't do, contrary to occasional usage - it just means you're doing so for your own reasons.
Nor does it mean that humans can't share pretty much all their algorithms for finding goals, due to a common heritage. And this would make humans capable of remarkable agreement about morality. But to call that an objective morality would be stretching it.
Do you believe in an objective morality capable of being scientifically investigated (a la Sam Harris *or others*), or are you a moral nihilist/relativist? There seems to be some division on this point. I would have thought Less Wrong to be well in the former camp.
Edit: There seems to be some confusion - when I say "an objective morality capable of being scientifically investigated (a la Sam Harris *or others*)" - I do NOT mean something like a "one true, universal, metaphysical morality for all mind-designs" like the Socratic/Platonic Form of Good or any such nonsense. I just mean something in reality that's mind-independent - in the sense that it is hard-wired, e.g. by evolution, and thus independent/prior to any later knowledge or cognitive content - and thus can be investigated scientifically. It is a definite "is" from which we can make true "ought" statements relative to that "is". See drethelin's comment and my analysis of Clippy.