If you go up to him and say that he needs to remember that if he doesn't pay, bad things will happen. He then says (According to the subtitles) "Pay you to protect me? You can't even protect yourselves!" though his spoken words are saying "You demand payment for protection but you can't even protect yourselves!".
Though when doing the optional and destroying his statue and saying "That was from Brynjolf. Get the message? His dialogue will read "You demand payment for protection but you can't even protect yourselves!" as well as saying the correct phrase.
Seems as though both options will play the same sound file even though one has different dialogue subtitles.
Sorry if this was in the wrong section I don't know where I'd go to report bugs but I figured I'd post it somewhere.