All the patriotism tends to just come off as arrogant to a lot of other countries (you know, the whole "Greatest Country Ever" kind of thing). There's a sense that a significant number of Americans see themselves as the centre of the world. Also, you took football, a sport where you kick a ball with your feet, and turned it into 'soccer,' before replacing it with a sport with a comparatively low foot-to-ball contact ratio. As a Brit, that annoys me relentlessly. Oh, and that irritating tendency for American culture to seep into other countries, which is a great thing in some aspects, but I tire of turning on the TV to find some new, mediocre American sitcom filling up the TV schedule. Don't even get me started on all the needless American versions of words that looked perfectly fine before. Color, for example, when it worked perfectly fine for many years as 'colour.' Same thing applies to verbal stuff, like saying 'herbs' with a silent 'h,' and just sounding artificially French in the process.
Don't get me wrong, there are a lot of things I like about America. I know that many of it's citizens are wonderful, intelligent people. Many of my issues are trivial. Oh, except for all the wars. Not to mention the fact that my own country still thinks that it has a 'special' relationship with the US, and will therefore follow them into any war it chooses to get into. But most of the rest, like I said, is trivial stuff. All countries have issues, it's just that the US tends to get more media coverage.
EDIT: Forgot to mention all the really fundamental Christians. That kind of bugs me. You know, the ones who are really adamant that evolution shouldn't be taught, or that homosexuals should be lynched. The ones that put God above all else, and regard other religions, or atheism, as inferior and misguided. Them.