I'm not sure the same can be said of crystals or rocks.
I’m not sure either. But the idea is not ridiculous. Is it part of a spectrum, or is there a clear cut off point? Some would place the cut off before trees, or before insects, or some other creatures, for that matter.
The fact is that the only thing we can be absolutely certain about is that we exist. In that sense the experiential precedes the physical. We can be surer that we exist as thinking beings than we can be about the existence of the external world.
The existence of the external world, and its nature as either experiential in character or without awarensss, are matters for speculation.
Plus there’s something a bit troubling about the coherency of materialism taken to its reductionist extreme. Have you ever read Daniel Dennett on consciousness? He argues that consciousness is purely a physical process and consciousness is a sort of illusion. But if we are suffering from an illusion that we exist, then who is suffering the illusion? If we want to talk about nonsensical philosophical positions that would be a better example.