actually I misspoke - what @Charlie said. but I think the use of "it" when referring to humans has a "dehumanizing" impact to it.
although do curricula regarding family, gender identity, expression, and sexual orientation even being taught consistently (or at all) in elementary school? I would think the earlier students are exposed to the idea and knowledge of these, the less these topics become foreign to them growing up. although I do wonder if these topics, including how related English language changes, are overseen by district or county or state.