[just another ref]

As others have said, no matter what the fan said, it doesn't come close to justifying the reaction. We may never know what was said. As far as the fan, who knows? He may be a psycho who just loses it at games, and he may be cold and calculating and works at shouting the most inflammatory thing possible to unnerve the opposing player, which certainly worked here. Even if it was a racial remark, the guy may or may not be a racist. No matter what was said, was any law broken here? Whether there was or not, this is not an officiating issue.