Good grief, all because the guy has vaguely brown skin. Get over it, man.
Being likewise British, I have no horse in this race. But this ^^^ is the part that always blows my mind.
In the interest of full disclosure, Italy is not without its issues, too. Last year the new head of government appointed our first black minister (CÚcile Kyenge
, Minister for Integration and International Cooperation). Some people went completely apeshit about it, including some politicians (which had already been pretty unhinged, but still), calling her racist names and arguing she wasn't worthy to be an Italian citizen, let alone a Minister of the Republic. She shrugged it off, but it was really shameful to witness. So I'm not going to cast the first stone against the whole US for it. There are racist people everywhere: sometimes they are just louder and more idiotic than other times.