What is the ruling on using abusive language towards those who mock something brought by the Messenger of Allah, peace and blessings be upon him, such as the niqab, or towards secularists?

It is legislated to defend Islam with proof and clear exposition. It is permissible to utter phrases of insult against a disbeliever, an apostate, and one who mocks the religion, for the Prophet (peace and blessings be upon him) approved of this. The Muslims strived against the polytheists with their wealth, their lives, and their tongues. The Prophet (peace and blessings be upon him) used to say to Hassan ibn Thabit, "Slander them, or lampoon them, and Gabriel is with you." Sheikh al-Islam Ibn Taymiyyah said that insulting the religion and reviling the Prophet is a form of striving and warfare, and striving with oneself can be with the tongue and the hand. Ibn Battal indicated the permissibility of satirizing and reviling the polytheists and seeking victory over them by condemning them and mentioning their disbelief. Al-Hafiz Ibn Hajar stated the permissibility of reviling a polytheist in response to their reviling. Sheikh Zakariyya mentioned that the prohibition of satire is specific to a Muslim, and it is permissible in the case of a disbeliever, an innovator, and an openly immoral person.