This comment is as mindless as the generalisation it's applying to an entire population.
If you can't actually see how the American state (not population or country) has devolved into something to be concerned about over the last 20 years, perhaps you're not looking hard enough.
Domestic politics and policies are cruel and divisive, international policies have regressed dramatically (i.e. they've pulled out of major international treaties around arms and climate and trade).
In the eyes of the average world citizen, America used to export an aspirational culture, now they export greed, cynicism, and technological dystopia (and I don't mean Facebook, I mean mass surveillance and drone warfare).
They are of course not alone in all this, but they are the biggest and most powerful country on the planet, so they lead by example, and it's becoming a shittier example every year.
So yeah, as an outsider looking into the US, I don't find that comment mindless at all.
America, the people, is still a source of pride for me but one can hold that view and still see significant flaws with how our government acts on our behalf - or despite it.
I find this timeframe strange. Although the US has had major policy mishaps in the last 20 years (Iraq war, NSA surveillance, etc), imo policy is still better than at any other time in America's history.
What timeframe do you think had "better" policy?
Mind you, I'm not saying that he's right. I'm just saying that you didn't actually answer him.
After that began US's relentless creation of the modern, comprehensive surveillance state. It is the largest possible government and will effectively repress our great-grandchildren and theirs.
As an American, I advocate some isolationism to protect other countries. The reason is that other nations are proving grounds for the future mistreatment of US citizens. Protecting other countries now protects future Americans.
So "stop dealing with the USA" is supposed to mean stop dealing with the US government? I don't think so.