Huh... I'm American, and I don't find it offensive... Obviously I can't speak for all Americans, but... Most of the time when I see people say "'Murica", it's usually other Americans. In my experience we're pretty good-humored about our own cultural narcissism. And really, of all the things to get offended about, why that? Now, making fun of our health care system is offensive because that is a real problem for us that is cause for a lot of anger between our political parties. But "Murica!"? I'll laugh right along with you about that.