No. No we're not. We realise that Colonialism was a bit of a dick move (to say the least) and we've put that stuff all in the past. (Personally I don't see why colonial Europe, escpecially Britain, is hated so violently - there was nothing we did that the Romans didn't do, and worse. Not saying that colonial Europe was good, I'm saying that the fact that the Romans were older didn't change the fact that they were arseholes too.) No, the reason that Britain, Europe and indeed most of the world hates America is because, as a nation (and I stress, AS A NATION - American people (those I've met, at least) are some of the nicest in the world), over the course of the last century, have completely fucked a lot of things up. Also, Americans are generally too quick to atribute any major achievment to their country (although that is probably the fault of Hollywood, who seem to think that every major advance and achievment in the past 500 years has been American - U571, anyone? Among countless others). However, I am stereotyping. Every nation has problems drilled into it by its culture, government or media, with no exceptions. For example, my country, Scotland, has severe problems with violence, drinking and obesity. It's a stereotype, but why are stereotypes stereotypes? Because they're kind of true. Obviously, all stereotypes are simply exagerations of the fact that a country/culture has slightly more of that problem then another. That doesn't change the fact that the Scots invented the Steam Engine which powered the Industrial Revolution, the telephone, the radar, the television or the radio, and it doesn't change the fact that America is a great nation with many significant achievements.
Anyway, I've gone off on a tangent. Back on topic, I generally find that Americans care a lot more about the civil war then we do. You tend to view it as the rise of a great, independant nation of freedom and true democracy, while we just tend to view it as one of those things which happened. Everyone likes to remember their victories, I guess.