1. I’ve always been (and still am) a Mickelson guy and there was a bit of rivalry there. 2. Tiger was the popular, always trendy choice, generally I cheer for the underdog or the rival of such a team/player unless I grew up a fan of such a team/player. 3. Tiger always kind of seemed like a bit of a jerk. Not engaging of fans, etc.
I always loved watching him play, he was amazing. But not my favorite player.