Was Oropher upset that Thranduil made Ava queen when he sailed west? Did he think she was capable, or would he have rathered Thranduil gave the Throne to a male as is tradition?
Thranduil had nothing to do with Avaleina becoming Queen when he left. While the leader of the Greenwood Elves uses the title of a Monarch, power is not gained or passed in the same way as a traditional monarchy.
Their leaders are elected by the Silvan people; Avaleina becoming Queen was entirely the decision of the Greenwood Elves.
So no, Oropher has no negative opinions about Avaleina being elected queen after Thranduil sailed west.










