The study of subjective and objective is fairly interesting. But this discussion, along with the relativism and absolutisms, has one primary problem; they lead to simple disagreement and no real search for truth. A subjectively thinking person can simply brush off something said by a objectively thinking person because the schools of thought. The subjective does not need to comprehend much less debate the statement made by a objective. The objective person knows that not every thing is objective (ice cream taste good). However the subjective person can say that the world being round is simply my understanding of the truth and there for it needs no more consideration. The same is true for the relativist and absolutist. To have a good discussion two things are need. 1) Ground rules are need, what assumptions are both party's basing there argument on. 2) A winner in the end. No one watches a boxing match to see a tie. Until these two things are implemented talking is just a wast of time and energy. The Bible would be a good base to work form. Not everyone agrees that it is true but they can argue that its not.

2 Timothy 2:16
All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness,