This expression is a strange one but it originates from the idea that people used to believe that it would be impossible to import oranges all the way from China without them being rotted and ruined. Hence, if somebody presented you with a tray of perfect oranges that had come from China, you might not believe them!
-Creo que deberías llamar a Luis y pedirle disculpas.
-¡Naranjas de la china! Todo ha sido culpa suya y yo no tengo que pedirle disculpas a nadie.