Ahmad Rida Khan, the founder of the Barelvi movement famously stated: “Anyone who does not declare the Deobandis as unbelievers, is himself a disbeliever” 

This is completely unsurprising. Shaykh Nuh Keller says that this behavior of the Barelvis is a form of Takfiri ideology, and one of the most evil of innovations. Barelvis regularly excommunicate other Muslims, including Deobandis, Salafis, and other non-Barelvis, and even those who refuse to takfir non-Barelvis. 

The Shadhili Ash’ari Shafi’i Shaykh Nuh Keller (May Allah preserve him) states about the Barelvi takfiri ideology:

"The sad irony in this was that the greatest ‘Wahhabi’ bid‘a of all, takfir of fellow Muslims, was unleashed in India by denunciations of “Wahhabism.” Ahmad Reza’s fatwas depicted his opponents as “Wahhabi sects,” which his latter-day followers came to declare all Deobandis to belong to through a sort of “guilt by association.”"

The Barelvi mass-takfir is true ghuluw, extremism, bid’ah, and takfiri ideology. They also slander and speak horribly about the elders of Deoband and other scholars who do not align exactly with their creedal views. 

May Allah protect us all from the extremist Barelvis.