The booing started after the war dance, it has not been going on for two and a half years. Racist merkins have been sighting the 13 year old girl incident as well as his playing style as build up to what the situation has escalated to.
It has been going for almost every away game over the last 2 years, I know, I've watched most of them. But it has gotten worse with time.
Yes they've called him a bully for pointing her out when a) he didn't know her age, b) it doesn't justify calling him an ape, and c) he accepted her apology and called on people to educate her instead of hating her.
And yes another red herring is they say he is an umpires pet when he has only been given 11 free kicks all season, which places him at about 200th in the AFL.
Being awarded Australian of the Year made it worse. And he was given that because of his indigenous work. So that is another racial issue.
The BigFooty thread on Goodes has gotten to 8621 posts and it is basically all arguing whether this is or isn't racism (there is a poll in that thread and 68.8% of people think it isn't racism, 68.8% of people on BigFooty are either ignorant at best or racist at worst).