It would seem to me...the way to go, is to get out ahead of the trend, and double-trend this thing down.
So you would suggest to the snowflake teacher that when addressing you, they need to say “me mi-me mi”. When the teacher starts to address your son, the teacher needs to utter “he be-he be”. If addressing your daughter, she’ll be referred to as “she be-she be”.
You just go and invent these out of thin-air and memorize them. Let the snowflake know that you and your kids are special and unique but totally different. You let other parents in the group know the tactic and have them invent new trendy pronouns as well.
We need a hot summer to melt these snowflakes.