I can't say.
But for those who insist one must stand for the flag simply out of respect, I would ask: How DO they feel about the camera operators, stadium workers, vendors, etc, who go about their business while the anthem plays?
"Oh, well, they're just doing their job."
OK, then, so we can all agree there are shades of grey in criteria for respecting the anthem/flag. Or that it's little more than a manufactured, symbolic gesture. Or both.