Referee Iglesias Villanueva stopped the match in the 68th minute as part of LaLiga's protocol against racism after he heard fans in the stands calling the Argentine defender a "monkey" and the Spanish coach a "gypsy".
The club have also been fined 27,000 euros ($29,000).
The RFEF said in a statement that the closed area in the stands must display a visible message condemning violent, racist, xenophobic and intolerant acts in football and support fair play.