the parent may or may not have over reacted. but i do know the boys half of my former elementary school used to hire girls to go through textbooks and edit the pictures and content. we used to complain cuz they didnt do that for the girls.
one week my brother came home with a times for kids mini magazine. blacked out was a sentence that the world is x many years old.
my HS bio book had a whole chapter removed. i think its obvious which was removed.
when i read caine mutiny court trial for a book report, i read the unedited version. curse words and all. when my HS decided to use that book as a class book, they got enough copies for the entire grade and the secretary sat with a sharpie and edited every copy.
personally, i dont think there is a problem with calling a spouse “dear”. but i do think its the schools responsibility to check kashrus of books. IIRC there is mosdos press or something along that name in cleveland that makes kosher textbooks
i do know my HS left the word “damn” (a separate peace). the teacher substituted the word “darn” when she read it out loud.