Booooooo! Hang on, there's no-one there. I think they must be piping booing over the PA to make an atmosphere.
I don't blame you, after all, it was written in a time when we were kicking your asses out of our country, huh? :yep Just kiddin'...
There's not much we can do to prevent punks from booing the U.S. Anthem in a foreign country. But try that again in America.