The AICC general secretary also called the BJP "ungrateful" against the backdrop of an 86-year-old Advani staying away from the executive meet for the first time in his entire political career.
"My heart goes out to Advani ji. He brought BJP from 2 to 182 in Lok Sabha. But then the ungrateful BJP is a party with differences," tweeted Singh.
Asked whether Gujarat Chief Minister Narendra Modi could be projected as a BJP's Prime Ministerial candidate after his anointment as chief of the party's election campaign committee, Singh said, " it was for BJP to decide."