People who believe trans and non-binary is a new thing, have not done their homework or have a really white European perspective on gender. The two gender binary was created in the 1800's and is a lot newer than transidentities. Just because you have not educated yourself on a matter does not mean you are right. It's just mean to use your lack of knowledge as a tool for bullying people who already is treated bad by society.
The European centered research for transpeople had come a long bit, before the nazis in Germany closed down the research and burned it all. There are also many examples of transidentities existing for hundreds of years outside Europe. Your white privileged point of view is not accurate. Feminism based on white privilege and erasure of gender identities is just white supremacy captalism. Don't fall in the trap and turn into a helper of the patriarchy.