Oppositional behaviour

Oppositional behaviour is the phenomena in that an individual will seek to contradict a person seen as holding influence over them, especially if that individual is seen as negative or hostile.

This can occur even to the extent the individual will do the exact opposite, and contrary to the expectations of the contradictory individual, will actually make their behaviours predictable, and worse, controllable.

In a sense, it is this behaviour that reverse psychology seeks to exploit.

Psychology
As a part of avoidance theory, individuals will avoid and even oppose individuals they see as negative to their own point of view, to the point they may contradict valid statements or suggestions out of opposition and hostility.

This might have short-term survival benefits in that ignoring the suggestions of a perceived enemy who may intend to harm you may prolong your survival, however Asch conformity experiment demonstrates that the human mind is often not capable of reasonable thought in group social dynamics, and individuals who are perceived as enemies who make valid statements may find their statements ignored to the detriment of the individual opposing them, a type of guilt-by-association fallacy.

As a result, favourism of positive-seeming individuals (superficial charm, etc) versus rejection of negative-seeming individuals (negative victimisation behaviours seen as hostile, etc) is often to the detriment of the individual making choices based on favourism as it prevents critical or analytical thought processes to veto or accept invalid or valid ideas.

As an individual being oppositional:
Accepting ideas from individuals perceived as hostile or negative may be difficult, especially as part of a conditioned response, however the way around it is to analyse the proposed idea as if the person was a robot with no feelings or preferences, only noting vested interests (as part of a valid RAVEN assessment) after the ideas have been independently analysed.

Dealing with oppositional individuals:
Oppositional individuals can be difficult to overcome if a proposed idea is simply ignored because of personal grudges or similar, however a cognitive dissonance attack can at least reset the playing field to level, but not necessarily fair, opportunity. The suggestion could alternately be merged as part of a stacked list which means the idea isn't necessarily seen as yours but one of many suggestions of which you are the originator for.