When only the pole A (respectively the pole Ā) of a given duality is considered, it consists of a one-sided viewpoint. Things are seen exclusively from the perspective of one pole. It contrasts with the two-sided viewpoint, with takes into account both poles of a given duality.
The consequence of taking only into account one pole is that the other pole is ignored, or disqualified. In cognitive psychology, the resulting cognitive distortion applied to the positive/negative duality is termed ‘disqualifying the positive’.