Why are the Shi'a sometimes called Rawafid or rejectors by their opponents? What did the Shi'a reject?

Shi'aRafidi
Why are the Shi'a sometimes called Rawafid or rejectors by their opponents? What did the Shi'a reject?
Rebecca Masterton, Dr Rebecca Masterton graduated with a BA in Japanese Language and Literature; an MA in Comparative East Asian and African Literature and a PhD in Islamic literature of West Africa. She has been... Answered 5 years ago

They rejected the legitimacy of the caliphates of Abu Bakr, 'Umar and 'Uthman. Initially the name was used pejoratively by the 'Uthmaniyya, but it was taken up and used by the Imami Shi'a themselves.