Let's say by objective ethics we mean a set of rules which there is an imperative to obey which are the same for all beings. So if by the rules of baseball you are talking about a game which could have different rules for a different league then that would not be objective in the same sense. However, if there is only one true set of baseball rules that all people must abide by to be playing baseball than that would be objective.

So do you believe that ethics are just an invented rule system that could have a different form and still be as ethical? If so, are you saying you follow ethical relativism or some form of subjective ethical doctrine?