
Latecomer
I always figured his antipathy to other races was related to the two attacks on Canterlot in recent years. If there are further personal issues he’s had with non-ponies, it was likely ambassadors and other ones visiting and living in Canterlot.
He also has no substantial dislike for non-unicorn ponies or other established citizen-races like donkeys - although he hold to some degree of stereotyping and supports “separate but equal” education overall, he has been surprisingly open to mixed education and better at allocating educational subsidies fairly than some of his predecessors. (He is rather urban-minded, though, considering rural education a token nesscesity.)