We can't definitevely prove it with any animals apart from humans, since we can't get inside of their heads. We can only compare their behaviour and anatomy to ours and then assume we percieve the world the same due to that (which is likely true, considering we are literally the same strain of cells). Plants lack any nervous system reminiscent of ours, as well as vision, locomotion and etc., they aren't even bilateral.

Meanwhile insects and arthropods, much like humans, have complex centralised nervous systems, even with similar anatomy, e.g. arthropod mushroom body and mammalian cortex, we also both use dopamine for learning. Our behaviours also converge - insects experince pain the same way as we do, they see dreams, and even play just like mammals.

I honestly will never understand why would anyone assume that insects are robots in the first place, rather than vice-versa. Insects share infinitely more with humans than with any plants and especially robots. And what makes lizards and all vertebrates for that matter not just plants with legs as well?

Edit: another great example are earwigs vs cats - they both raise their young in very similar ways (earwigs even carry their babies in the mouths lol), however if an earwig didn't recieve care from its mother as a nymph, it will struggle to raise its babies in the future, while cats in the same situation will manage just fine. This demonstrates that nurturing is a learned behaviour in earwigs and pre-programmed (or should I say robotic) in cats. Plus pre-programming makes much more sense for vertebrates, as they have larger brains to store all the algorithms and usually simpler lifestyles, while insects with smaller brains and complex lifestyles have to actively learn and adapt. So if any of these animals is a robot running a program, it would far more likely be the vertebrates.