If your claim is that there is no objective reality, then what is the reality which subjective reality is standing upon? It must be based on something else because multiple realities cannot exist independently of one another. The objective reality that we are all existing and experiencing is what ties us together. Complete subjective reality makes the claim that you can do whatever you want, whenever you want, however you want, based solely on your beliefs. In this case, there would be no such thing as wrong or right beliefs when that is disproven by our experience today. It doesn't take much to realize there are positive and negative forces in the world.
We may not know exactly where the objective universe exists. After all, our senses rely on our minds. You know what I mean if you've seen "The Matrix." The movie isn't so dissimilar to what we are experiencing here. To Neo and the rest of the dreamworld people, their subjective reality is just a dreamworld. But what is true reality is what is behind the glitter and glam. This is what Neo sees when he takes the (red?) pill.
Perception is subjective. But what is our perception based on? Something that is concrete and unchanging.
The objective is affecting the observer by the observer's interpretation of it. It is not all or nothing.
What truth we accept for ourselves is the truth for our subjective reality. But it does not mean that there is no Ultimate Truth, independent of our perceptions.
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