I think that argument depends on a certain definition of "objective". A professor of mine argued that there are objective moral values because that there are certain actions that basically all people consider wrong. For example, killing an innocent person for fun. Under his definition, that would be an objectively immoral action.
The notion of objective moral values is that the "right" moral values exist independent of humans and the human mind. (I think.) It is usually a position held by religious types like William Lane Craig.