Why are there so many American Haters ?

Well "American Haters" may be a too strong of a terminology. I picked this off of another post in internations forums. I should probably just say Anti-American .... whatever.

There are things I like and things I don't like in USA but I know that no country is perfect but in my experience during all the international meet ups, online forums and even during my travel if there is one country that gets the majority of "Meh.. BOO." comment it's towards USA. I have of course heard for other countries as well but the percentage is very less comparatively.

Why is this, I am really curious in a neutral way ? Is this because of American politics , culture , education, public beliefs ? Why......