The Star Spangled Banner.

This is a national song, which enjoys a unique position. These sports groups (evidently just about all of them) are anti-national because they are anti-US.

Now hear me out, cuz this may be a shocker:

Perhaps it should be illegal for these groups to use the National Anthem. Oh, anybody can sing it. But observing it as an group-act of sedition, is perhaps not anymore free speech. A bit beyond.

Just sayin'. Maybe I'm wrong.