Just a quick note, you don't use learning stuff as defence, because you aren't supposed to be getting a Japanese language/culture lesson, you aren't supposed to be watching it to learn, if you are, you are either a Japanese student reinforcing their knowledge of the language (not some dude who wants to learn, you already know enough to understand a lot of it yourself but not all or you need some reinforcing, linguistics students do this sort of thing,) you are not the intended audience, you are not getting the same experience as the original audience, the translation is bad. If you want to learn you read a non-fiction book, or watch a documentary or something, you don't watch a cartoon, you may learn something because you read a book on Japanese culture and you saw it in an anime which helped you understand it better, that's great if that happens in fact, but you aren't watching the shows to learn.