These conversations drive me insane. There isn't even an clear or even consensus definition of consciousness, yet here we are all acting like we are talking about the same thing. "It's right there, don't you see it? That's consciousness! We just need to define what it is so we can figure out if it's real or not".
Thomas Nagel's definition of consciousness is pretty good: "an organism has conscious mental states if and only if there is something that it is like to be that organism—something it is like for the organism."