People who are prejudice against people who eat rice or have any affiliation with rice (Asians). They tend to be very arrogant towards anyone from Asian descent or who look remotely Asian.
Nate: Please pass the white rice.
Curt: Why's it gotta be white?
Nate: What? I like the white rice better.
Curt: You got a problem with the brown rice? What, are you ricist ??
(This is a direct transcript of actual events. The names have been changed for an inside joke.)