What was interesting is that one of the UK commentators said something like 'I hope the British fans do not boo the US national anthem' and then there was an awkward period when we hoped that they wouldn't but most of us knew that they would. It is embarrassing and is something that I absolutely detest.
In the UK typically when a visiting fighter comes to defend a title or challenge for one he has to suffer the indignity of being booed during the prefight introduction and playing of the national anthem. It pisses me off.

Still, the playing of the national anthems irritate me no end although even that has its humorous moments like watching, one of my favourite fighters of all time, J C Chavez try to remember and mumble the lyrics to the Mexican anthem.