Given that the source of derision is egotism, at first we should try seriously to fight against this feature and then it's so helpful to know that the importance of respect of believer, is more than Kaaba (God's house)!
Question:
How to stop making fun of the others?
Answer:
Source of derision is arrogance and egotism. In addition, egotism originates from apparent and materialist values. For example if someone considers himself richer than the others, more beautiful, or more prominent, this persuades him to ridicule the others. Also sometimes, this consideration is in knowledge and worship while measure of value in the sight of Allah is righteousness.
It should also be noted that there is no result for derision except disrespect the others while the respect of the believer is more important than Kaaba (God's house)! [1]
Note:
[1] Bihar al-Anwar, v.64, p.71: "الْمُؤْمِنُ أَعْظَمُ حُرْمَةً مِنَ الْكَعْبَة"