Oftentimes employees are asked to undertake tasks that are unreasonable or unnecessary, referred to as the illegitimate task. Such illegitimate task at the workplace is quite an overlooked and a novel stressor that can violate the employees’ expectation regarding what they feel can be expected from them. The current study proposes that such violation of employees expectation due to undertaking such illegitimate task can often take the form of misdirected retaliation towards the co-workers in the form of workplace incivility. Thus, per the foundations of psychological contract and moral disengagement theory, the current study proposes that such misdirection of retaliation materializes through the process of moral disengagement by which employees rationalize and justify their covert and ambiguous mistreatment of co-workers. Moreover, the current study also uncovers the counterintuitive effects of perceived support which intensifies an employees’ tendency to undertake moral disengagement due to illegitimate tasks. The current study therefore proposes a moderated mediation model and finds its support using a three-wave time lagged survey from working managers from U.S (N=222). The theoretical and practical implications along with limitations and future research are also discussed in the paper.