Me:  All governments enforce some system of property rules.  Treating some good and services as being in the commons is just as valid as treating them as private property.
JD:  No, property rights are a natural right, and using force to confiscate them is a basic violation.
Me:  Well, that's how you want society to act, but right now you're in the minority.  Rights shared fictions which are determined and enforced through social processes.
JD:  No they aren't.  They exist independently of what people think.
Me:  Well, you and I have different ideas of what would constitute basic rights.
JD:  But mine are objectively true.
Me:  Can you prove that?
JD:  It's self-evident.
Me:  It's evident to your self, but not to mine.  If they are true and not a human fabrication, surely you can prove their existence in some way?
JD:  I already explained in our previous discussions that they are intangible, and by asking for evidence you are not taking this seriously!  [swearing possibly ensues]