Whether or not these other life forms intend to do harm, there would be a tumult over matters of equality and possession. The human race has been unable to deal even with variations on a theme of its own species.
No matter the elegance of their customs or deference of their tactics, the aliens would be scorned by the greatest percentage of our population. There is no need for Disney or Cameron to bear this out. No one is astonished by human's long history of intolerance.