Today Nasibies conspire and they try to show themselves as Sunnies, or otherwise try to show that Sunnies are the Nasibies. It is very necessary to watch through their conspiracy and to end thier conspiracy.
Ahle-Sunnah are our Muslim brothes, Nikah is allowed with them, their life and goods are as respected as our own. Ahle-Sunnah indeed love Ahlebait (as).
While Nasibies are the one who hate Ahlebait (as).
Sunni Scholars themselves sent curse upon the Nasibies
Salafi Alim Imam Shawkani writes:
وإذا ثبت أن الناصبي من يبغض عليا عليه السلام فقد ثبت بالأحاديث الصحيحة الصريحة في كتب الحديث المعتمدة أن بغضه نفاق وكفر ۔ ۔ ۔ وثبت أن من أبغض عليا فقد أبغض الله ورسوله وبغض الله ورسوله كفر ۔ ۔ ۔ وفي الباب أحاديث كثيرة من طرق عن جماعة من الصحابة.وفي هذا المقدار كفاية فإن به يثبت أن الناصبي كافر، وأن من قال لرجل يا ناصبي! فكأنه قال: له يا كافر ۔
Translation:
it is provem that nasibi is one who has grudge for imam ali asws, and it is provem without doubt with sahih ahadeeth which clearly say in book of ahadeeth that his (imam ali asws) grugde is hypocrisy and kufr (and then shokani mentions books and narrations) , so it is proven that being jealous from him is being jealous from allah and his prophet and being jealous from allah and his prophet is kufr (again, he mentions books), and in this regard there are many ahadeeth from chains to sahaba, and that amount is sufficient to prove that nasibi is kafir, and so if someone calls a person ya nasibi, it means he said ya kafir
Reference:
[al fath ul rabbani min fatawa imam shokani, vol 2, page 873-876, printed yemen]