Once again, I find myself agreeing with apushatayid. But really mw13 said it best. “There is such a thing as a kosher outlet…”
While I’m not recommending that someone in seventh grade (or anyone for that matter) watch movies, a person must pick battles. PG movies are not the best thing in the world, but if something is kosher its ok. If something is neutral, is it automatically bad simply because its not good?! If everything is forbidden, everything is allowed.