I agree with some of the comments on YouTube that the Americans have a strange fear of the finger. They will not even show it unscrambled in this video clip. In general US media do not show pictures of people flipping the bird or making what they feel are insulting or obscene gestures.
I believe that the finger is not really obscene, but in most cases a gesture of defiance. It can also be a playful gesture of outsmarting someone or being smug to the competition, as it is in this case, which is related to defiance.
But there is hardly ever any sexual connotation at all. Nor is there always an insult. Unless you feel insulted by the open defiance. Perhaps some people simply cannot stand other people showing their defiance. Do they have difficulty accepting gestures of defiance? Somehow this is turning into something alltogether too much political and too close to current events.