USA! USA!

Why is it that, when the Democrats chanted "USA" during Obama's speech, I found it stirring? It felt like they were saying "Wow! I love what this country can be, even though we sometimes fall short."

When Republicans chant "USA," it sounds like "Fuck the rest of the world! We're number ONE! And we love America more than the other party!"

Maybe I'm just reading into it...but I'm not the only person who notices.

How did “USA” become a term of defiance and division? It sounds ugly, like they’re saying: “We’re real Americans – and you’re not.”