pennausamike is the only person who provided an actual answer to the question (although I would say that you're reading too much into the Na'vi lifestyle, I don't believe it was Cameron's intention to present a hunter-gather society as the ideal).
With due respect Cessna, you just rephrased what you've already written, and that doesn't answer the question. You didn't name anything specific. You haven't defined what it means for Cameron to be a hypocrite nor what it means for him to NOT be a hypocrite. You're maligning him with no evidence, and with no rational reason or standards for doing so.
It's beyond obvious. He advocates strongly that we the masses must sacrifice and get by with less. When his own lifestyle is one of extreme consumption.