A.) Soylent Green is people!!!!
B.) It's a cookbook!!!!!!
C.) None of the above.
No, given the state of political correctness, especially on college and university campuses these days, the real SF movie reference isn't a line at all but a movie image, this one:
"LOOK! A TRUMP SUPPORTER! KILL IT!"
Image from Invasion of the Body Snatchers (1978)