If the world is totally objective, then nothing is subjective.
Isn't that the same kind of false dichotomy that you present?
No. What I was saying is that if a subjective thing exists, it exists even if there exists no absolute variant thereof. There is no absolute humour, yet humour exists.
Who agrees? Who asks? When a kid sees someone slain in the streets, no one conferred with the lad to see if he approved. He intrinsically knew it was abhorrent.
He doesn't intrinsically know it was abhorrent. If the person who was killed and is a criminal - the kid might not think it is abhorrent. If they are any member of outgroup it is conceivable that lad doesn't have a problem with it.
If he does have a problem with it, it's because he came to that conclusion either through a reasoned argument or more commonly because of the community standards.
It does not work that way. So where do our sense of morals derive?
We innately try and avoid doing wrong things and try and do right things. That's just a consequence of being a highly social ape. Not all people have this same sense, but in general it is the common tactic, with a few 'cheaters' in the mix.
Where do we get what is a wrong thing and a right thing? That depends on the social environment we find ourselves in. If you have grown up to know that killing a disabled child is the way your society deals with disabilities, you may well agree that doing it is right and letting the child grow to adulthood is wrong.
Yes, but who or what is structuring it?
Normally, it's a free market of ideas - but there are usually at least few people that try and actively restructure the current culture. The freer the culture, the more people can take part in this. Otherwise, it is structured passively - people largely take the lessons they learned from adults they grew up with with some personal modifications here and there.
Is unfair, or is it your opinion that its unfair? Does fairness even make sense in a relative way?
Unfair as in unequal as in - all views don't have equal voice. Fairness can be an absolute concept, and it was how I was applying it.