Because of course this happened in Oklahoma...
It's the only place I've ever been to that had two story single wide trailers... In tornado alley. That's the level of sophistication we're talking about here.
How can you expect ignorant hayseeds to comprehend the nuances of something like identity? The Native Americans they slaughtered while holding a Bible had two-spirit people, but that fact, no matter how well you prove it, will not stop them from hating and killing anyone that doesn't wave their Bible, twist it into a cudgel, and use it to beat people down.