What is Flattery or sycophancy? It is  sweet talk or  lavishing of unmerited praises and those who practice it have an obstinate and obnoxious obsession to project, falsely adore and admire a leader. They  pretend to be well wishers of the leader but in reality are responsible for the failure. 
 A leader who loves flattery are  mostly despots with a penchant for authoritarian streaks, who does not believe in orderly administration of justice. He  keeps personal ambitions and egos above anything else  and the interests of the community  is  hardly a matter of concern. What follows will be that the relationship between the leader and the community at large, especially at the grass root level, is completely  cut off to be replaced by a narrowed down relation  between the leader and  the  coterie of a handful of sycophants around.  Such a leader will never know or care to know  the truths and real facts but will depend on lies and fabled stories, wisdom and discernment  could hardly be seen in their  words and decisions. Result,   love and reverence is replaced by hate and contempt , willful obedience  is replaced by vengeance use of authority and coercions and threat of punishments.  History proves, time again, that  such leaders are doomed to fail and meet their disgraceful end.   
What does Bible says on this ? Is it Christian to practice sycophancy, promote it or partake it  or be silent when we see evils ?