If you want to use anthropological findings to make a point which I suspect is something like "fags are ruining America" based on your persona here, I'm going to make you at least work for it. So before I agree, I'll need you to expand on the following:
1. Tell me exactly how you feel that the linguistic reification of an expanded gender identity in isolated South American tribes ties into the cultural downfall you're referencing - and I'll even help you a bit and say that certain aspects of Western Roman civilization may sync up with an idea like that, though I've never heard or read anyone's work that references it as a causality. To my knowledge, they're completely different things.
2. Tell me whose work exactly you're referencing.