On the contrary, I base my position on how physics is actually done. This includes the physics that Einstein did. In particular, spacetime geometry is what Einstein studied in his theory of general relativity. While *absolute* time, in the sense of Newton, is gone, time is a physical thing that can be measured and be affected by matter.<quoted text>
Your belief that time is a real thing, a physical thing, and has some kind of independent existence outside the human mind is delusional, bubba. For you this belief is obviously a sacred cow. Evidently you're still stuck in the Newtonian concept of time that Einstein disproved decades ago.
No, time is NOT merely our mental perception. If that were the case, then times shorter than our ability to perceive them would be meaningless. But, for example, our visual perceptions cannot distinguish events that are closer together than 1/30 of a second. Our auditory perception can do better, but still fails for time intervals less than 1/10,000 of a second. But it is standard in physics to work with time intervals less than a nano-second. We now produce laser bursts lasting less than a femto-second. This is far, far below any possibility of perception by the human senses. But it still makes sense. And that shows that time is not merely a human mental construct.Time is not physical, it has no physical or chemical properties and its not an invisible force like gravity. It doesn't act on or interact with anything. Time is just our mental perception of the rate at which the "now" changes and the rate of change of this "now" is neither constant nor fixed. Newton was brilliant but he was wrong about time.
Even more, we know that matter and energy can change the spacetime geometry (this is gravity), so the geometry is not simply a mental construct, but an active dynamic part of the universe. This is part of Einstein's contribution.