There is a case for the argument that Opposition Leader Peter Dutton is divisive. But Douglas Mackenzie, of the ACT, argues that when Mr Dutton opposed the Voice to parliament, it was divisive (Letters).
The leader of the opposition is supposed to put an alternative view and policies. In the case of the Voice, he put a view that was supported by the vast majority of Australians (except in the ACT). You could just as correctly claim that Prime Minister Anthony Albanese was being divisive when he refused to modify his Voice proposal.