Spin. It is not an AMERICAN custom. To adopt a foreign custom as an American head of state is an act of submission.
Besides, that wasn't even a peck...it was more of what we call an "air kiss" in my neck of the woods which is perfectly acceptable, that practice actually came from Hollywood,CA. It was first cited in an article in the Chicago Tribune in 1887 and then in 1975 in Newsweek. So, it is, distinctly, an American tradition.