It's called "anthropocentric" not "solipsistic". Solipsism has nothing to do with it. But except of terminology, I agree with you. I would even go as far as say

It's called "anthropocentric" not "solipsistic". Solipsism has nothing to do with it. But except of terminology, I agree with you. I would even go as far as saying, that there's nothing that makes humans objectively "smarter" (not to mention "better") than rocks: it's just that the range of possible actions rocks are to perform is much more narrow than that of humans, and contains just one item — laying around. Which, I might add, rocks are executing much more perfectly than humans are typically performing actions they are to perform.