He actually didn’t hate art as such. His objections were more sophisticated.
He despised the flaunting of wealth and luxury exemplified by the aristocracy of the Renaissance. A big part of this was of course by means of artwork. He did not object to religious artwork as such, but he did object to the portrayal of Jesus, Mary and the saints dressed in luxurious costume and in fancy surroundings.
He thought, not unreasonably, that this was a blasphemous distortion of the Biblical account.
He also thought, with Judas, that artwork and other vanities were a waste of money that could be used to help the poor.
I find Savonarola an interesting person. But I don’t like him. Neither did the Church, apparently! Throwing art onto bonfires is not my idea of holiness.