If you hate me, you hate the D, please
I'm taking shit back, to the riots in the sixties

from Royce Da 5'9" (Ft. Eminem) – Rock City Lyrics on Rap Genius

Meaning

He’s referring to Detroit as “the D.” Detroit is famous for race riots. During this time, “White Flight” became rampant as the city of Detroit crumbled and watched it’s populations vacate to the suburbs.

Specifically, he’s referring to the Detroit race riot of 1967.

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