My oldest brother is the most immature

He's one of those Otaku types. I think thats what they're called in Japan.

Why is talking about anime immature?

Would you like a hard boiled candy? They are extra minty! No fiddly wrappers either. 🙂

He could be. Saying he is, doesn't make it so, you know?

I don't see a problem here

It's how he acts when he's talking about it. He's always making strange sounds like a little kid....apparently making references to these animes and it just appears childish. I'm not gonna sit here and act like its ok for men to act like boys.