https://www.amherst.edu/people/facstaff/aguttmann
It's pretty impressive.
It seems unlikely to me that he is ignorant and has no desire for understanding.
It's possible he is wrong--lots of people are about lots of topics. This is his specialty, but I (and likely no one else around) am in no position to evaluate his claims.
So rather than calling him names and insulting him, tell us why he is wrong, or reference additional source material, or something. A simple web-link will do.
I mean this in all sincerity. Name calling doesn't stop ignorance, education does.
Regardless of the name, Amherst College is very highly respected in the social sciences, which (collectively at least), are very much in favor of careful, thoughtful study of cultures not their own. It shows up in the top-twenty (often much higher) of nearly every ranking for which it is eligible.
That said, if that one fact is enough for you to disregard this professor's fifty-years of research, I don't think we can have a further discussion.
Good luck to you.
What is your source of credibility, other than a vaguely racist username and declaration of kinship?
I apologize for any accusations explicit or implicit in saying "vaguely racist username".
Edit: After reading their comment history, maybe not..
But you seem to have the same problem.
It's not your ball game unless you're a time traveler who invented the primitive game X years ago from a society that no doubt killed gays and treated women like shit as all societies did back then and some still do.
https://en.wikipedia.org/wiki/Two-Spirit
http://www.firstpeople.us/articles/the-two-spirit-people-of-...
Also, Maya !== North American First Nations