I think that (besides America's foreign policy) people who dislike the US are simply jealous. Of it's size, superpower status, wealth etc
Honestly, I think more people are disillusioned by the way the US is headed rather than having any dislike for it.
The US had a great start, brilliant progressive ideas and high ideals to which it aspired. Alas, these days that American dream seems very far away and at times it even seems to have turned into the American Nightmare.
Between a greedy and callous power-elite and a culture that almost seems to revel in ignorance things aren't going too well. Add to that the arrogant and ill-considered approach to foreign policy that has been the hallmark of american governments in the last couple of decades.
To give one example - take the bin Laden case. A criminal mastermind is assassinated
in a mission based on intel gained through torture
... and people are in the streets celebrating this and there are headlines like "Rot in Hell". What about democracy, where's the dignity, the self-scrutiny?