Adventures in Horrible English

This is an actual, verbatim excerpt from an English language textbook that one of my kids is using. Nothing was changed.

Christy: Hi Daniel, what's that in your pocket?
Daniel: Ah, this? It's my new Busta Rhymes CD. It's awesome! Do you want to see it?
Christy: Nope. BR's not my favourite.
Daniel: Isn't he? Who's your favourite then?
Christy: I haven't got a favourite.
Daniel: You don't like rap music?
Christy: No, not at all.
Daniel: What kind of music do you like?
Christy: Actually I'm not keen on music. I like computer games. No, I love computer games. I play non-stop.
Daniel: You don't! You don't play on the bus! And I listen to music every where.
Christy: You don't! You don't listen to music in class.

Can anyone tell me what the heck this is supposed to teach kids, or when this situation would arise?