Isn’t that the purpose of school? To make kids try and expand their thinking to think about things they don’t think about in normal life. A normal average teen does not think about chemistry, math, physics either. Will everything stick? Probably not. But some might stick for some students and that’s better than just giving up and only teaching teens about things average teens are naturally interest in (sex education?)
There's a difference between teaching kids stuff they aren't interested in in order to expose them to it (good!), and teaching kids stuff that require the lived experience of an adult to truly understand and appreciate (of dubious utility!).
The two main purposes of school are to provide day care for workers' children and inculcating obedience to authority.
The comment you're responding to is talking about books that students will "barely understand". You're talking about subjects teens aren't interested in. The comment above says nothing about interest and specifically does not advocate against teaching things to teens just because they aren't interested in them; only if they won't understand them.