That’s funny. A French teacher. French is completely based on things being male or female. You can’t have the language without the basis of there being two genders and it’s a no no to mix them up.
Every student who supports this teacher should go into school and make demands to be addressed by teachers/administrators as something other than what they are. Change it up the next day and the day after that. They have what, like 50 genders to choose from now ? Create chaos to illustrate how poorly thought out it policy is.
I'm glad I wasn't born French, because that's a language I never could have learned.