I don't condone teaching babies cuss words. Clearly these kids are trying to please Dad for the camera. The fan sentiment I understand. The clip had comedic value due to the unexpectedness & surprise element.
I'm a Giants fan & probably have had those thoughts rolling around my mind for decades. I'm also a Yankees fan, so I understand how the fans of the opposition feel. (Damned Yankees come to mind).
I would hope that in a moment of clarity the dad who took that video takes the time to teach those kids about "potty talk".
But, God help me, it was funny when I first saw it.