Based on the false feedback procedure in an experimental group setting, this study analyses the ingroup bias change as a result of an individual ingroup bias evaluation (individual feedback: fair vs. discrimination) and an ingroup norm (fair vs. discrimination). The results show the existence of two different process of ingroup bias change. One occurs just as a consequence of a discriminatory individual evaluation which produces a reduction of the initial ingroup bias. The other occurs as a consequence of an individual–ingroup norm discrepancy, when the fair evaluated subjects converge towards the discriminatory in-group norm. These findings give empirical support to the normative discrepancies theories which states that the idividual-norm divergences rather than the convergence are the main dynamics in prejudice and social discrimination changes and shown that cultural and ingroup norms must be take into account in this research field.