Re: Shia And Sunni Muslims
In case if your molvies with Nasibi tendencies had hidden the actual definition from you just because they are now are shameful of the fact that there are some Nasibi and Khariji characters in your principle books, and their piooner ones had good relations with those people, then let me enlighten you with correct definition 
In *“Lisan al Arab” page 762, Ibn Manzur *states:
“Nawasib are those who hate Hadhrath Ali, and embrace that hatred as part of their faith”
In *"Taj al Uroous page 277, Volume 4 Chapter “Al Ba Murtazi al Zubaydi” *we read:
“Nasibi are those who hate Ameer ul Momineen Ali bin Abi Talib (as) and take that enmity as part of their faith”.
"*“Tadhrib al Radhi” page 311 Allamah Jalaladeen as-Suyut *provides the following definition:
“Nasibi ideology means hating Ali and preferring Mu’awiya”.
“Hadiya al Sahil” ay adalta al Masail" page 96elaborates yet further:
“Nasibi ideology is a type of flawed character that is very bad, in its worst form is has a hatred for the Imam of Guidance Hadhrath Ali, and takes this as part of its Deen / Iman”.
If that is not suffice, then let me cite from Ahla Sunnah’s one of the important work “Siyar Alam al-Nubala” by Imam Dahabi. On its margin wirrten by by Shaykh Shu’aib al-Arnaout, we read:
من الناصبية وهم المنافقون المتدينون ببغضة علي رضي الله عنه ، سموا بذلك لأنهم نصبوا له وعادوه
“From Nasibiyah there comes Nasibi and they are hypocrites, they have made the hate of Ali as their religion. This name was given to them because they have made the hate of Ali as their aim of life (Nasbu) and had enmity for him”
Siyar Alam al-Nubala, Volume 4 page 37 (published in 1993 by Risalah foundation, Beirut. Lebanon)
Also see the definition of ‘Nasibi’ in famed Islamic dictionary 'Al-Qasmoos al-Muheet"