Xavier Dolan is a wonderful genius who exposes a new vision of the cinema. No matter if you like him or not (personally he's my favourite filmmaker and I love his personality he's not pretentious. ) but he has this special way to turn movies into something unic and change point of view. Favourite movie was Laurence Anyways. It literally changed me .
I don't know him, but those who make comments on his personality could be mistaken. Whilst it may not always come across, he's probably actually a decent individual - bare in mind that he may not have experienced a happy childhood (homophobia, etc).