Nasiba (from the Arabic word ناصبة ) is a derogatory Islamic term among Shia and Sunni Today the term is used by most Shia to refer to the Salafi sect.
Salafis and Wahhabis regard Shia as heretics. Massacres or persecutions of Shi'a include the Wahhabi sack of Karbala in 1801, Taliban massacre of Hazara Shi'a, and guerrilla attacks in contemporary Pakistan and Iraq).
In Sahih Muslim Zirr reported that 'Ali observed: By Him Who split up the seed and created something living, the Apostle (Mohammed) gave me a promise that no one but a believer would love me, and none but a hypocrite would nurse a grudge against me.
Rafida
Salafis use the word rafida (and also the Arabic non-collective singular form rafidi رافضي) as a derogatory term for Shi'a Muslims and refuse to accept Shi`a Islam as being a valid form of Islam.
It is a term to denote religious opponents, which refers in a derogatory way to those who (in the opinion of the person using the term) reject the authority of their leaders.
In past times "Rafidi" used by some Sunni historians to refer to some Shi'a who refused to follow Zayd ibn Ali. It is thought that the usage of the term came from Zayd ibn Ali himself who exclaimed "You have abandoned me (rafadhtumuni)" to some of his followers who retracted their oath of allegiance then they asked him to refuse to acknowledge Abu Bakr and Umar but Zayd ibn Ali said no,so they left and rejected him. It was also used by Salafi Muslims as a term of abuse for Shi'a Muslims. They were considered "Refusers" because they refused to give allegiance to Sunni Caliph Abu Bakr, and refused to recognize the authority of the others Sunni caliphs.