'Murican, here. My country's inability to understand that distinction has always annoyed me. Props to whoever popularized the first word of this post - it pretty clearly distinguishes the western hemisphere as a whole from just the idiots in the middle of it.

That said, I think the subtle condescension is lost on most of my countrymen - most of us seem to find dumb shit relatable, and even adopt it as a rallying call. 'Murica/n is no exception.

I've never known anyone here to take issue with "United States" though. It comes off as more formal than the other options, but not disrespectful or anything.