Fivio Foreign is having a hard time wrapping his head around 21 Savage calling Nas"irrelevant" ... and not only because he was featured on Nas' Grammy Award-winning album a couple years ago.
TMZ Hip Hop linked with Fivio Tuesday at LAX, and he was quick to crown Nas "King of New York" in wake of 21's slander.
The way Fivio sees it ... after 28 years of prolific music making, Nas has earned carte blanche status in the rap game, and can legitimately have zero fear of ever being obsolete.