Because, while the country itself is good, american posters on 4chan, aside from being ubiquitous, tend to be really annoying and lack the little something european posters (germany excluded) have. When an american poster does something good, it's just an american and you don't remember it, but when an american poster does something shitty, it's "ah, another shitty american". And many burgers here are /pol/tards, which makes them even more unsufferable.
