People can force themselves to be outraged over just about anything.  Jehovah's Witnesses don't stand for any anthem.  Do we make a production over this?  Most people don't even know it, and wouldn't if it weren't for the media, who job it is to agitate and inspire division.  So long as someone doesn't interfere with others' display of patriotism, I see no problem.  (And my dad was a career AF officer who fought in 3 wars, and who is interred in Arlington.  He felt the same way.)