Don't answer this question based on the biasesness shown by Bigg Boss for taking away Nishant's captaincy. Maybe it was unfair. Maybe it was not. But it's a fact that :
He got influenced by suggestions of others. He requested Tamboli to get out of red zone when someone told him to. Then he warned her to get out of red zone when someone told him to. Then he decided to punish Tamboli by taking away her stuff when someone told him to.
All his decisions were not of his own but on someone's influence.
Bigg Boss had to call out Rahul, Pavitra and Tamboli for not wearing mic in Nishant's presence.
Bigg Boss had to call out Nishant himself two times for not wearing mic.
He was talking to Abhinav in English.
He also was taking it easy when other housemates were sleeping during day time.
And the tipping point was him discussing about nominations with Jaan and Tamboli.
Bigg Boss couldn't have ignored this. Maybe they should have given Nishant another chance or maybe they were right in taking away his captaincy. That's up to debate. But one thing can't be denied that Nishant was a bad captain, even if it was just for one day.
Not watching previous seasons of Bigg Boss is a ridiculous excuse. Rules are there for everyone to see in the house, and Nishant should have taken his captaincy seriously when he knows he's not Bigg Boss favorite.