Of course, disrespectful speech should be promptly corrected, but there is a difference between teaching children how to communicate politely and dictating what they say.
فَكَيْفَ يُشَجِّعُ ٱلْوَالِدُونَ أَوْلَادَهُمْ عَلَى ٱلتَّوَاصُلِ مَعَهُمْ بِصَرَاحَةٍ ؟‏