I think it's more disgusting that "conservative" British politicians have treated an American visitor this rudely. Romney did not hurl insults--he offered a fair critique. Cameron was just as worried about the threat of strikes last week. The security problems have been obvious and did not arise simply because London is "in the middle of somewhere."
So all in all, it seems fair to suggest that anti-Americanism still exists across the world and that Obama really has only glossed over it. They like Obama for his charisma, skin colour, and "health care." Romney did little wrong, but they're press has gobbled him up and spat him out because they've already decided they prefer Barack. That sure sounds fair.
If you ask the average person on the street about Obama, nine times out of ten, one of those three reasons come up.
Though in terms of the press, you can't say the Telegraph and Daily Mail 'prefer Barack', the comment sections on both papers, as well as their columnists, often rave about Romney or at the very least moan about the Presidents 'ineptitude'. I believe its more a case of the right papers flaunting their 'patriotic values' by defending the London Olympics against a foreign critic.