Actually I am a Kantian idealist, who experienced QFT calculations. On the other hand, I have no first hand experience of a proton. So yes, I stand corrected.

Actually I am a Kantian idealist, who experienced QFT calculations. On the other hand, I have no first hand experience of a proton. So yes, I stand corrected. But empiricism dictates, that the experiment is correct and the theory is just a description of the experiment. And if we discard empiricism, then we can not really talk about physics anymore.