Andrew Sullivan has this post on the new Anti-Americanism.  First, America isn't a singular concept and the Anti-Americans are actually targetting something deeper:

America is many things - now, perhaps, more than ever. It is rural Alabama and urban San Francisco. It is Michael Moore and Jerry Falwell. It's Colin Powell and Don Rumsfeld. It's MTV and the right to bear arms. It's a country that still won't accept a one-dollar coin but embraced the Internet with the enthusiasm of a teenage crush. It's cowboy country in Wyoming and Little Havana in Miami. It's Rambo and the "Sopranos." It's Little Vietnam in the exurbs of Virginia and mega-churches in suburban Houston. Anyone who despises all this despises not America but humanity. And humanity in one of the most daring multicultural, multiracial experiments in human history.

And, Sullivan points out that it isn't simply a rationalist, proportionate response to specific policies such as foriegn aid, Kyoto, and the like.   It's deeper and creates weird perturbations even within traditionally leftist ideology:

But the anti-Americanism I'm speaking of is not of this kind. It's not designed to persuade the United States to alter its policies in one arena or another. It's designed to demonize the United States as a whole, to portray it as almost morally equivalent to the Islamist terrorism it is trying to hold back. In fact, this anti-Americanism - which embraces the far left and elements of the far-right as well - rarely proposes anything positive. And as it recites its mantras of anti-American contempt, and summons every American failing of the past fifty years without ever crediting America's successes, it marinates in its own resentment. It teeters on the edge of anti-Semitism and occasionally embraces it. In its hatred of the United States, it even finds itself close to finding excuses for the barbarity of Saddam Hussein, the cruelty of the Taliban or the malevolence of al Qaeda. There is something truly sickening in the sight of people who call themselves liberals finding more fault in America than in the brutal, misogynist, homophobic, anti-Semitic dictatorships who are now pitted against the West.

...The facts don't seem to matter. America is portrayed as an imperial force dedicated to what a Harvard professor recently described as "the crushing and total humiliation of the Palestinians." Yet it was an American president, Bill Clinton, who only two years ago brokered a deal that offered the Palestinians sovereignty over 98 percent of the West Bank and Gaza. (Arafat said no and his people are still living with the consequences.) America is described as waging a war against Muslims. Yet in almost every recent American intervention - in Somalia, Bosnia, Kosovo, and Afghanistan - it was for the sake of the security of Muslims that American soldiers risked their lives. America is described as relentlessly pro-Israel. But America gives almost as much foreign aid to Egypt and Jordan. America is described as imperialist. But in Afghanistan, recently liberated by the U.S., the Americans have done all they can to set up an indigenous government, capable of self-rule, and are pouring millions of dollars into reconstruction. America is described as unilateralist. Yet, after the worst terrorist attack in modern history, the U.S. patiently assembled a coalition to rid the world of al Qaeda's Afghan bases, and has waited eleven years while Saddam has violated almost every term of the 1991 truce. Even now, the U.S. has gone painstakingly through a U.N. route to achieve its goals. These are simply the facts. But in the new cult of anti-Americanism, facts don't seem to matter.