No it wasn't and the facts suggest you cannot conclusively conclude that it was.On the evidence the booing was all about race. No amount of excuse making will change that.
You can go on with your PC warriors and apologists and leftists and all the other rubbish, simple fact remains, the booing of Adam Goodes was racially motivated.
Also the only one who made that Carlton game racial was Adam Goodes with the celebration.
Finally were Bombers fans racist for booing him here? Note how this is before the Australian of the Year and the Ape incident...