I don't think it's him the people actually hate if they just tapped into themselves to discover their underlying anger. Their hate I believe is based on the vanity of the entertainment industry that hammers into society the belief to worship celebrities, in which the worshippers are comprimised almost entirely of women and gay men.
If Bieber is musically talented then his music certainly doesn't show it and that's due to the entertainment industry knowing that the largest profit to be made from him is to appeal to those with the minds of children who are captivated by flashing lights and repetitive sounds. I would love to see Bieber produce something on his own merit without the dilution of commercialism. He is certainly talented.