He was the young buck once upon a time that was trying to steal Arnie's thunder. Tiger is hated for a different reason. Tiger is hated for the same reason Wilt Chamberlan was hated. And Muhammed Ali, and Jim Brown. They were all, for a short period of time so dominant in their sport that it just didnt seem fair. They literally changed their sports.
Tiger forced Augusta National, a place that resists change more than any other, to literally change the rough and the course because he overpowered it. Then the media jumped on and justifiably began to ask, "if Tiger isnt playing, why watch". This pissed off more people. Think of Wilt Chamberlain. He was so tall nobody could guard him. He put up ridiculous numbers until better competition came along. Muhammed Ali changed boxing from the brutal puncher to the dance and talk crap style. Jim Brown was like a Semi Truck going through a bunch of volkswagon beetles.
In each case, those athletes 'ruined' the competitiveness of the sport for a time and lowered the admiration of favorites who were playing during that time.
But nothing is forever.