They ain't mention Bino? Man that shit must be on purpose, right?

from Childish Gambino (Ft. Nipsey Hu$$le) – Black Faces Lyrics on Rap Genius

Meaning

When you think of the best rappers in the game, you automatically think of Gambino. So if you don’t mention him when talking about who the best is, you must’ve left him out on purpose

Also possibly a reference to him never being chosen to be on the XXL freshmen list, he knows he’s dope and he feels as if they’re teasing and messing with him by not mentioning him.

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