A singer whose performance during Sunday’s Grammys broadcast offended Catholics and others issued a defiant tweet as experts warned she could lose fans, Fox News reports.

Nicki Minaj shocked some viewers with her high-concept performance of “Roman Holiday” from her upcoming album, which included what has been described as a self-exorcism. Experts have warned that negative reaction to the performance could hurt album sales.

But Minaj apparently is unconcerned. The singer issued a tweet Monday saying: “Stay offended. Not a single F**K is given,” according to the report.

Ronn Torossian, CEO of 5WPR, told FOX411’s Pop Tarts column: "Nicki Minaj was clearly aiming for shock value and mass PR, and she succeeded. With big ideas and shock value comes big opportunity, but also backlash. She has to be aware of possible alienation from some … current fans, who take religion and spirituality seriously."

Catholics in particular were offended. Said Bill Donohue, president of the Catholic League of America: “There are Catholic priests who are trained to perform exorcisms, and it seems plain that the time has come for Nicki Minaj to make an appointment. Even worse than Minaj is the Recording Academy that runs the Grammys — they knew exactly what she was going to do and gave her the green light. I’ve never heard of a collective exorcism, but there is a first time for everything.”