Ramanujacharya was a saint who propagated Vishishtadvaita Vedanta philosophy by writing commentaries on Prastanatrayi. Before him, Shankara preached Advaita Vedanta and after him Madhwacharya propagated Dvaita Vedanta in the same manner. It is well known that Madhwa and his followers accused Shankara as an incarnation of a demon named Maniman using some scriptures like Garuda Purana, Vayu Purana, etc. Now I came across a strange claim that Madhwa's followers even accused Ramanuja as a demon. A member from a discussion forum says the following:
The knowledge imparted by Sri Ramanuja Acharya is uncontaminated, free from maligned motivations and supremely correct. The authority of his perfection of bhakti is shining in the form of his magnum opus, srI bhAshya, though all his other works are also equally great. He taught the world how to self surrender unto the Supreme Lord as inscribed in the scriptures. In spite of all his glory, the followers of Sri Ananda Teertha blaspheme such blemish less Sri Ramanuja with harsh words. Their Acharya even present Sri rAmAnuja as an incarnation of a demon named Vatapi.
My question is, which work of Madhwacharya or his followers/disciples or anybody from his Guru Parampara says this?