Other mental content is communicable because it's a lot simpler. All of the data of an entire human brain state, even considering only a snapshot taken at one instant in time, is many orders of magnitude of quantity/complexity beyond what the conscious mind is capable of considering and understanding.
Other mental content is [...] a lot simpler
Is there independent evidence for that?
http://esr.ibiblio.org/?p=1192#more-1192
ADDED: Even if you disagree with ESR's take, and many will, this is the clearest definition I have seen on what qualia is. So it should present a useful starting point, even for those who strongly disagree, to argue from.