@Ratttz Now of course, I personally agree that the golden rule is pretty decent. I just don't think that's an objective truth. And yes, some things are more easily agreed upon than others - I think we can pretty much all agree that we'd prefer it if the world were more as we prefer it, for example. (That's basically a tautology.) But that doesn't make it objective.
And yes, I know this basically puts me in exactly the position you were complaining about, holding objectivity as some universal truth. But, at least for the moment, that's where I stand. I don't think that anything two people can agree on is objective. :/