I can’t tell what she said at all. I don’t like Michelle Obama at all, really she’s pretty b*tchy it seems to me, but I very much doubt she said “all this for a flag” or whatever.
Those words don’t “fit” when you watch the video.
There’s definitely one more syllable than “all this for a flag.” I’m guessing it was “all this just for a flag” or “all this fuss for a flag” or “all this sh*t for a flag.” Whatever it was, there’s no mistaking the facial expressions and body language, hers and his.