It was a vague reference, but they showed a scene of a crowd of protesting Mexicans in this week's South Park, Episode 1005 "A Million Little Fibers."
Anyway, Towelie the talking genetically-engineered towel that does nothing but get high needs to pay the rent so he gets high to think of a good idea and decides to write his memoirs, "A Million Little Fibers." But no publisher wants it because people don't care about autobiographies of towels. So he gets high to come up with another idea and changes every instance of "towel/towels" to "person/people" and resubmits it as author Stephen McTowelie and it is published and promoted by Oprah and becomes a best seller.
Oh, so while on Larry King, Geraldo Rivera in Iraq breaks in with a special report and exposes Stephen McTowelie for the towel he is. Geraldo calls him a towel, Towelie responds by calling Geraldo a beaner towel. Oprah trashes him on her show for lying and mobs of protesters demanding refunds because had wasted their time changing their lives thinking his story was real. And another group of protesters is the Mexicans upset that he called Geraldo a beaner. They were holding signs that read:
"T� eres una toalla!!!" "Beaners es Rascisto!!!" "Viva Mexico" "Hola Mam�" "Viva Mexico" "No Viva la Towel" "Mata la Toalla!"