Lookin at themselves in the mirror backwards
Can't even face themselves,

from Jay-Z (Ft. Beanie Sigel) – Ignorant Shit Lyrics on Rap Genius

This is also pointing out the following line in which Robert DeNiro is facing a mirror in the movie Taxi Driver (in the famous “You Talkin to Me?” Scene.

In the next bar, he mentions not rappers not facing themselves in the mirror (same scene)

Maybe I made too much of a stretch with this one…

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