you know it yourself, see what follows
The definition of moral is what is right and wrong, there is no doubt about that.
That we call the reference for evaluating Human Rights is cultural (language), but it does not matter how you call it. I go for this definition of Human Rights (at this moment):
A right is something you can defend.
There are Human Rights that every human has, since there are things a human can not accept others would do to him.
I assume the exact definition of Human is unimportant at this stage, sufficient is ... the ability to defend their rights.
Thus To have a consistent set of rules the human can not infringe the Human Rights of anyone else either, thus all humans have the same human rights.
Thus Human Rights are universal for humans.
Thus it is wrong (opposite of right) to act against Human Rights, it is against the definition of right, since if you do not accept someone else has the right then you can not defend it for yourself anymore.
Thus A morality (in sense of right and wrong) is wrong if it does not respect Human Rights. You can measure A morality (in sense of right and wrong) against Human rights.
And there is no way of measuring morality as you say, but I'd like to see your attempt at quantifying and proving morality's objective "part".
You morality has the subject "right". There are rights that are universal as proven above, Human Rights (or whatever you call it). Your morality is about wrong, as this is everything that is not right and there are universal rights so there is universal wrong. The universal parts are objective.
This thread is based on the principle that you should remove the subjective (cultural, value, ...) part of the definition.
So their conclusions are not wrong when you add the point that you value the subjective part more and thus do not value a definition without a subjective part. On top of that if you add your subjective part to their logical reasoning, you will come to a logical reasoning that has an objective part. A logical reasoning that you will value with assumptions you will value. It is up to you to create that reasoning.
In my case:
My morality is about being able to assume your choices (Good v.s. Bad), not about right and wrong, it is language (subjective) but the principles stay, no matter how you call it.
So why do I apply human rights, in what I call my morality.
Immoral is what is objected by rules in my moral.
A moral choice (good) always invalidates an immoral choice (bad).
The best choice is the choice that holds most value (subjective) according to my moral in the available choices.
I can assume my choice by choosing the best choice.
If I end up with best choices that I can not value differently, I try to inact, since I have no basis on which to take a responsibility. (Thanks Famine)
I can not evaluate all choices due to Bounded Rationality.
Thus: My choices are guided by my concept of rights. I can not accept that people would not respect my rights, but for that I need to respect their rights.
Since: This is exactly part of my definition of Human Rights, Human rights are part of my moral.
I believe to have come to the conclusion that good is not purely subjective, at least there is a part in it that is universal (respect of Human Rights). What had to be proven.
As you see moral is subjective for me, it is about value you put on a choice, so inherently subjective, it does not remove that a part is objective and that it always is linked to human rights.
Objective def
Things that strictly exist in one's brain (ie morals, rights etc) can't be objective if we go by any of the defintions.
If you do not value a logical reasoning, you should state why you do not value the used definitions/assumptions.
I do not value your definition that rights are just in someones brain, because of the Human Rights definition above that is valuable and makes Human Rights universal (=Uninfluenced by emotions or personal prejudices) = many brains even if they do not talk to each other. I do believe that you find very similar rights in the Bible, the Qur'an, Buddhist principles, philosophy, etc... but that is a consequence that is coherent, not proof, the logic above is proof.
Responsibility is about the act you did, the commitment you made with those acts, that is purely objective (Uninfluenced by emotions or personal prejudices). The definition of Danoff "Morality = acts that are in concurrence with human rights", has 2 objective elements so is objective.