God's moral laws are OBJECTIVE. They are from an outside, divine source. They are now for all people at all times in all places. Man's moral laws (apart from God) are subjective. They change over time and over cultures (prohibition, cannibalism, gay marriage) like people change their socks. There is little that is enduring in man's subjective morality.
Subjective and objective have little do with whether it changes with time or not. Get your terms correct,
Universal vs Relative (whether a property is context dependent or not)
Timeless vs Temporal (whether a property is time dependent or time independent)
Subjective vs Objective (whether a property is dependent on the existence of beings who experience things, i.e. a subject. or not)
Good and evil are event properties that are subjective by definition, because
they can't exist in the absence of a subject who is experiencing these events...unlike say the mass of an electron.
Eg:- A volcanic eruption in Mars is neither good nor evil as there are no subjects to experience the eruption as such.
Finally, a God's subjective assessments of good and evil are entirely His or Her own and have no apriori claim of preference over the subjective assessment of any other experiencing entity...like a mouse for instance. This is obvious to anyone who thinks for two minutes.