If consciousness is a physical thing, how can you be so convinced that it is impossible to talk about it in physical terms? Couldn't the difficulty be due to a deficiency in our current explanatory power, as opposed to something more fundamental? What evidence do you have to support that biological talk (about consciousness, or otherwise) is necessarily irreducible to physical talk?

These questions are very interesting and very hard, and dismissing honest attempts to grapple with them rigorously, wrong as they may turn out to be, seems rash to me.