Irrelevant. What humans do is not the determining factor for what is objective or not.
But you use the same logic when claiming what humans do as far as agreeing about morality because they have been conditioned determines morality as subjective.
It is practical to act as though there is some objective standard, but that doesn't mean that there is one.
Of course it does. You and I just acknowledged it in using an objective basis to measure what behaviour is acceptable or not that helps humans live together and flourish. All objective means is that there is some basis for measuring what is right and wrong behaviour outside the subject. When we refer to "what is best for humans to live together and fourish" we are using an objective basis outside the subject.
We may act like some particular standard is objective when it comes to morality, but that doesn't actually make it objective.
Why its still meets the requirements of what objective means which is "a measurement we can use outside of the subject for measuring something".
But that isn't a black/white issue, is it?
It is for most morals. Don't murder, rape, steal, descriminate, sexually harass, ect. They all prevent people from living together if allowed to happen without laws against them.
Just because there are more complex issues that need more understanding about how they affect society and make it harder to live together doesn't mean there is no truth to find. But just the core moral truths like "don't murder, rape, steal, descriminate, sexually harass", is a good start.
Once again, just because we ACT like something is an objective standard, doesn't mean it actually IS an objective standard.
But its not blindly acting like something is true and real. Its acting that way for a good objective reason we have rationally determined as correct. A rational objective reason you, I and most people use as a measure to prove to others what is the right moral behaviour to live together.
Otherwise you would have to say humans are decieving themselves and living some delusion. We then couldn't trust our own rationality anymore for determining anything as it could be a delusion.
That's unreal as we know that we are not deluding ourselves as we live that reality everyday and use that objective reason to live together. So we know its not a delusion because its practical and works.