The Star Spangled Banner was written as a poem not a song. The music it is currently accompanied by was written by a Brit for some gentlemen's club in London. It was named our anthem in 1914 or something like that.
Regardless of whether you want to term it as a poem or a song it isn't "disrespectful" to change the timing or metre of it during a performance. She's a performing artist, a singer, whatever you want too call it, she exercised a little poetic license. So what. You don't have to like it, nobody's telling you that you have to sing it like that from now on, sheezus. I didn't like the version but I'll be okay.
The funny thing is I was at a going away party for some friends when it came on and nobody stood with they're hand over their heart facing the nearest flag when it was played either. Something many bitched about and invoked their civic disgust when Colin Kaepernick and others took a knee. Seems like national patriotism has varying degrees of duty and importance to some, but maybe that's just my observation.
Hope this helps,
FDC
Sent from my SM-N950U using Tapatalk