Why did the disbelievers mock the believers?

Imām Ibn al-Jawzī (d. 597/1201) summarized the scholars' opinions in his book "Zād al-Masīr" as follows:

1. They mocked them because of their poverty.
2. They mocked them for their belief in the Hereafter.
3. They mocked them for following the Prophet (ﷺ). It is said that they would mockingly tell the believers "You are on the right path!"