I think the point is that as humans we have limited perspectives and most of us aren't even aware of those limitations. It is likely not possible for us to come

I think the point is that as humans we have limited perspectives and most of us aren't even aware of those limitations. It is likely not possible for us to come up with any moral rules that are in any way objective. Anything that we come up with is influenced by out human perspective and therefore nothing is truly objective.