I don't understand why people who claimed to be non-binary or their allies are angry the first time I said this. Non binary is a trend that emerges and one day will evolve into something else, just like fashion, goths or harajuku. They have bold appearance with bright colored hair or make up, and have become a clique with their unique chosen pronouns from "them" to "ze" and anyone who dare not use it correctly, will be bashed.
It's a trend because once they embraced it, they changed their course in fashion or way of living 180 without any signs to be like that beforehand. Unlike transgenders who has shown their tendencies to be transgender before they embraced their transgenderism.
It seems like the biggest issue with nonbinary is their correct use of pronouns. Which is why in countries without gender specific pronouns we've never heard of this bold type of non binary until it was popularized by an English speaking country. I bet even if they were born in a country where pronouns was not an issue, they will find another word to describe their quirky appearance.
Identifying as nonbinary is not a "trend." As time progresses, society becomes more accepting of things it didn't accept in the past. And with technology being more widespread, people are finding out about things they never would've found out about if they didn't have the internet. A person's feelings and self-identification of being gender queer have always been within that person, but when people discover an actual word or category to be able to express themselves to the world, they will use it. So seeing a "trend" of more people identifying as nonbinary is just a result of more people finding out that there is a word for who they are.