It has barely any history prior to 10 years ago. Just because some nobody said it once in the 1970's doesn't mean its been colloquially around for 50 years. The source of it "being around from the 1970's" is a dubious article written in 2015. https://www.telegraph.co.uk/men/the-filter/11597192/Whats-it-like-to-be-a-Mx.html
I don't want to send me kids to a school where the teachers intentionally try to impose their made up beliefs on them. Is it too much to ask for teachers to stick to the subjects they are supposed to teach?
Mx -> You uhh feel like you are neither male or female or something. keyword being "feel". The 3 above all are objective characteristics. The latter is not.
An adult should be able to teach kids without feeling the need to impose their own wacky views on them. Just use mr or ms. You are an adult, you can handle it.
can you point me to what I said that was bigoted?