Umayyad caliphate was One of the most "anti-shia" regime in history . In fact Shiism in history only gained ground as a form of moral resistance to the Ummayads and their demands ..
Except for Umer bin Abdulaziz , who is said to have given the controversial Bagh e Fadak back to the family of prophet and he was the one who put an end to the evil practice of cursing Ali r.a and his progeny from the pulpits of the mosques around the kingdom in Jumma prayers ...
Saying that Umayyads were Shia is like saying that Ayatullah Khomeini was a Wahabi
Hope that answers your question