I think the word "objective" when it comes to morality means neutral or just or fair judgement in all and every single case or in all circumstances or beliefs. To cover all cases this way means that it probably all has to be written down or fully spelled out 100%, 100% accurately in writing. Which could be a lot, or would be a very, very long book, or writing, to cover all and every single case, or every single exception to the normal rules in any or all cases, etc, 100% fairly and accurately and truly justly, etc. It is my belief that most exceptions to the normal rules would be in the minority, and that there are some rules that could work most of the time for the majority, etc, and that those could be short, or simple, but not at all short or simple with all that would need to be considered/taken into account to bring true justice to the minority, etc. But in his I am talking about the difference between those who are considered guilty, and those who might be considered 100% innocent, etc.
Because even with the guilty, then there still also probably needs to be consequences in a matter of degrees, and even in the majority of cases in which one might be considered guilty, that would mean considering most or all of the circumstances, which would add even a lot more words to the written down rules or writing in addition to how already long or big that book would be in describing every single individual case in which someone would or will be considered completely innocent of the crime, etc.
God Bless.