After former collaborating producer and friend Prolyfic had some choice words for Lupe Fiasco this past weekend concerning his album’s current status, the Chicago rapper responded via Twitter to counter the harsh criticism.

While Prolyfic blamed the delay of Lasers on his belief that it had no hit singles for Atlantic Records to get behind, Lupe stated, “PRO!…my man…[you’re] not my manager…fall back…take all that ‘advice’ and further your career with it.”

As the two Chicago artists haven’t worked together since 2006’s Food & Liquor, he continued, “You put yourself on the outside…so don’t be salty now that [you’re] being treated like an outsider…My career is mine. And I’ll proceed with it how I wish. [You’re] ignorant to my situation and why WE move how WE do. Speak what you know, not what you think you know.”

Fiasco added, “Frankly you know very little. But I KNOW you lil bro, I’m the reason they even know you at all…I pray you sell a few beats the same way [you’re] selling yourself right now. When the music stops who’s gonna have a chair to sit in?”

Though finished, Lupe Fiasco’s Lasers is still awaiting an official release date.