Will be interesting to see how your comments here date as panpsychism gains momentum.
And it is an exaggeration to say pansychists believe rocks are conscious. Unless you consider insects “conscious” for example. What panpsychists argue is that awareness is fundamental to all matter so that it varies in degree across a spectrum from human consciousness down to other animals, and whatever experience invertebrates have, down to plants, rocks and other objects, which may have very low levels of awareness.
There may be little or no empirical evidence for panpsychism. But then, there is also little or no empirical evidence that can be offered for the common materialist conception of the world either. These are philosophical conceptions for making sense of the world and how it works. Materialism is just the common sense, or taken for granted assumption commonly made about reality in our particular historical circumstances, and therefore highly susceptible to revision.