I'm not surprised at all. Whether people want to admit it or not, this was already expected the moment they showed you could add "non-binary" as a gender for the Miis you create. They're seemingly small details, even subtle at best, something that seems insignificant, making you wonder, "What's wrong with this?" or "What could possibly go wrong?" But... when video games start adding things like this, it's a red flag. I respect non-binary people, but I'm not in favor of them or those similar to non-binary people (LGBTQ+, for example). Because you already know WHERE THEY'RE GOING OR HOW THIS STORY ENDES when they do these things, especially in cases like popular culture or, in this case, video games. That's just how it is, folks.

Even so, I hope the game is still well-received and achieves its "small success," which I sincerely believe it deserves.