ANSWER:

What they say is baseless and a blatant lie! Such ignorant people have no problem even to lie upon the Prophet salla Allahu alaihi wa sallam to justify their evil. 

How to respond to those who say that a da’eef hadith reported 3 times in books of hadith makes it a sahih/hasn hadith, thus making it acceptable to be used for islamic rulings, as many people here in Pakistan use it to justify bi’dah!!!