negativism

The practice or habit of being skeptical, critical, or pessimistic, especially toward the views or suggestions of others.

Behavior characterized by persistent refusal, without apparent or logical reasons, to act on or carry out suggestions, orders, or instructions of others.

The stand-point assumed, or the views held, by a negationist.

A persistent pessimistic or skeptical attitude.

A stubborn tendency to do the opposite of what one is asked.

characterized by habitual skepticism and a disagreeable tendency to deny or oppose or resist suggestions or commands