I am still a bit at loss with the analogy.
Obviously, I saw that the kid was black. I also noticed the white fancy dress.
Just as obviously, we do have racism in Europe where I live. It is present everywhere you find humans. But there are subtle differences with the situation in the USA.
But, for me, the analogy fails on two points.
-a trivial one: i just see a child playing. I have seen other children playing with waves all the same. They know they will get their feet wet and they know it is without danger. Defying powers to exercise civil rights is not without danger and not a play.
-second: you can't really fight the sea and expect to win, while one can fight racists and expect to win.