What's going to happen when Mayweather realises that his comment that 'once the fight gets underway the fans can't help then' was wide of the mark?
It's a proper football (or soccer if you want) atmosphere. Booing the other team's national anthem has become a regular feature in the last few years. They shouldn't be doing it (it's embarrassing enough in football) but it shouldn't be taken seriously really. It probably doesn't help that the fight has been hyped a bit as USA vs England/U.K.