This is usually when someone raises his hand and is like, “Oh, I’ve really been enjoying the new Spoon single, that’s my Song of Summer.” Which ... no. Let’s be clear about how this works: There is no such thing as a “personal” song of summer. We do not anoint multiple songs of summer. There can only be one; the Song of Summer, by its very definition, is a consensus choice. It is the song that wrecks wedding dance floors. It is the song that you and your mother begrudgingly agree on (even though your mom has no idea what rhymes with “hug me” and won't stop yelling it in public.) It does not necessarily have to hit No. 1 on the charts, but it should probably be on the charts, because it must be widely played. It must bring people together. It must be a shared enthusiasm.
"But do I love it? Do I think it is a transcendent, unifying anthem worthy of our highest amateur pop-music prize? I do not. I think we, as a nation, can find a better Song of Summer."
So she's saying we can't have a personal song of the summer, but says she personally doesn't think "Fancy" is the song of the summer despite pretty much all evidence showing it is (well, either that or "Problem.") That's a weak argument.