50 is firing back at Tony Yayo after the G-Unit rapper complained that "50 isn't rocking with me the same."

Fif' tells Billboard, "I think the frustration comes from shock, probably, that it’s not everything they wanted it to be." Instead, he says Yayo should be grateful for all 50 has done for him. "It’s not a secret, it’s a known fact that he actually came home from jail with a million dollars and a Bentley."

50 goes on to say of Yayo and Lloyd Banks, "These guys are millionaires. They’ve made millions of dollars. Why do that then? Whenever there’s no one to blame, you know what game you play, [for] a look. I don’t know what the goal was."

50's first independent album, Animal Ambition, is due out later this year.