I'd simply say, I disagree with your definition of the value of subjectivity.

A subjective judgement can be 'true enough' for the purpose of moving forward in a pragmatic way, given an existential condition of 'not knowing'. We do what we can with the information we have. We discriminate. We make judgement calls. That is how we move past fear of the unknown and progress through a life of infinite potential for suffering and chaos. We act by instinct and conditioning. Subjectivity does not equate to incorrect. It implies a limited perspective and that is an existential condition of humanity.

We can choose for ourselves what is obscene, without being hindered by another's subjective objectivity.