It wasn't a contraction, it was bad grammar. you should have used "you're" in place of "your" that's why it was ironic.
You're a nobody = You are a nobody.
Your is too possessive, it doesn't makes sense.
You are right. The irony was plain to see.
I don't doubt for a minute that Chael is a nice guy. Its quite obvious the character he portrays is all bluster. Hype. And hes evidently quite apt with it.