"Hamid Ansari is such an unfortunate (durbhagyashali) person that no one in the country came forward in his support. Muslims in large numbers also opposed his comments," Mr Kumar said during an event in Nagpur.
The RSS leader said that Mr Ansari was secular during his 10-year tenure as Vice President, adding that he has become a hardliner (kattarpanti) after demitting the post.
The RSS leader also exhorted all those sharing a similar mindset to tell the name of the country where Muslims feel safe.
"I have one request to him (Ansari) and people like him who feel that Muslims are insecure, they should tell the name of the country where Muslims are secure and they should go and live in that country where they feel secure," Mr Kumar said.