I don't know why they are in an uproar over it. Catholic schools are religious schools. Therefore, they try to go by the Bible. Transgenderism is NOT in the Bible.
Catholic Schools' Shocking Mandate: Students Must Adhere to Biological Sex! Massachusetts in Uproar Over Controversial Gender Policy! (msn.com)​
Catholic Schools' Shocking Mandate: Students Must Adhere to Biological Sex! Massachusetts in Uproar Over Controversial Gender Policy! (msn.com)​