Generally, the meaning of this sentence is :"You'd better listen to radio than talk with him/her.He/she has nothing to do with this subject.". But it was said with sarcasm, a kind of: "Of course he is the best person to ask about it! Wouldn't it better to listen to radio?" Such sentence structure can be used in colloquial speech only and I wouldn't recommend you to use it, because it's quite rude