It is narrated from fourth Shia Imam, Ali ibn Hussain, Zainul Abideen (AS) who said:

The sins which cause torments and misfortunes to be inflicted on people are:

1. To disobey knowledgeable religious leaders unjustly
2. To rebel against people
3. To ridicule and humiliate people
4. To make fun of people [1]

[1] Tafseer Nemoneh, Vol. 3,Page 37.

Source: en.shafaqna.com