Let's assume for a moment that morality is objective. You might still have cases where what is right in one case is wrong in another.
That is incorrect. If you have an objective morality, some that is wrong is wrong in
ALL cases, by definition.
For example, honesty is considered a virtue. But if a murderer asked you which a way a man has gone, it might be better for you to tell a lie in that case.
Might be better I'll give you but if it is honesty is objectively moral, then lying to that murderer would be immoral, no matter the circumstance.
That is by definition.