Where does calling others by offensive nicknames stand in the Qur'an?

From "Answers from the Qur'an 3" documentary



Mexican Iman (Monica) Turns to Islam
06:50
 Mexican Iman (Monica) Turns to Islam
What are the benefits which observance of the morals of the Qur'an brings to the family?
01:32
 What are the benefits which observance of the morals of the Qur'an brings to the family?
Flawless aesthetics
05:13
 Flawless aesthetics
What does moral cleanliness mean?
01:52
 What does moral cleanliness mean?
What does modesty signify in believers?
02:24
 What does modesty signify in believers?
It is stated in the Qur'an that God does not like those who are boastful?
01:33
 It is stated in the Qur'an that God does not like those who are boastful?
Is it proper to complain about a disease disability poverty or physical defect?
03:08
 Is it proper to complain about a disease disability poverty or physical defect?
Is there any limit to good morals?
01:48
 Is there any limit to good morals?
How should one behave towards one's parents according to the Qur'an?
02:17
 How should one behave towards one's parents according to the Qur'an?
Do believers feel anger?
01:57
 Do believers feel anger?
Jesus ascent to God's presence
03:19
 Jesus ascent to God's presence
A trap is laid for the Prophet Jesus (pbuh)
02:58
 A trap is laid for the Prophet Jesus (pbuh)
The cooperation between the muscles and bones
02:44
 The cooperation between the muscles and bones
The Nazi's racist theoretician: Haeckel
04:20
 The Nazi's racist theoretician: Haeckel
How can infinite love and safety be attained?
HD
02:35
 How can infinite love and safety be attained?
The miracles of the Qur'an: A drop of semen
01:46
 The miracles of the Qur'an: A drop of semen
Camouflage in living things
05:34
 Camouflage in living things
The collapse of Darwinism in Europe (Russia)
05:51
 The collapse of Darwinism in Europe (Russia)
The collapse of Darwinism in Europe (Great Britain)
05:06
 The collapse of Darwinism in Europe (Great Britain)
The error of thinking that the term "forefathers" in the Quran refers to evolutionary forebears
03:07
 The error of thinking that the term "forefathers" in the Quran refers to evolutionary forebears
The error that Prophet Adam (pbuh) was not the first human being
09:04
 The error that Prophet Adam (pbuh) was not the first human being
Polls conducted in Europe confirm the dominance of belief in creation
09:03
 Polls conducted in Europe confirm the dominance of belief in creation
Greek Orthodox Patriarchate III. Theophilos
02:37
 Greek Orthodox Patriarchate III. Theophilos
JEWISH DAILY PRAYER
01:42
 JEWISH DAILY PRAYER
The end times II- The golden age
51:03
 The end times II- The golden age