The idea that Tibetans are backwards isn't racist, but saying that Sino-Tibetan or Mongoloids are genetically inferior and therefore backwards is.
It is simplistic to say that racism is only looking down on people because of their genetics. It widely considered racism to look down on people's culture and way of life. Which I think Ven. I has done with both Indians and Tibetans. If someone here described other cultures rather than Tibetans as "backward" they would be called racist and in far less polite and subdued language than I have used- look at some of the other threads. How do you think people would react if someone called native American culture backward?
As I pointed out we trumpet the miracles of the "Modern" Western paradigm as somehow better than "backward" traditional societies, I have already discussed this at length. The Western Industrial model has led to material comforts but an unsustainable lifestyle for the planet. Due to industrial society we are now facing a serious environmental crisis that threatens humanity and will make the discussions we have here seem utterly silly.
"Backward" traditional societies were far more sustainable and in harmony with the environment. The Tibetan plateau was almost like a wilderness reserve until the PRC came and began their program of mining and pillaging.