Like I've said before, it must really suck for you, because I've never encountered this type of behavior. Sure, I've had an argument of sorts with a student or two about a misunderstanding, but not a big one and certainly not one that left me angry. That usually ends in a draw anyway. Either they say it in Chinese where I can't understand it, or they think I'm too nice to say it to my face. Or...maybe they don't have much of an opinion on America. All I can say is that I guess it sucks to be you, and maybe you should consider a job change. My students have never said anything rude about America...although, come to think of it, maybe they are too shy and don't know enough English. I highly doubt that though. They seem like nice people.

I've learned not to argue with anyone that has no idea what they are talking about especially here in China. As far as the strange and regular accosting and incessant need for me to defend myself (as an American), I just try not to let it bother me. They're entitled to their opinion, I guess. I treat them the same way I treat crazy ignorant people in the states...just ignore them and hope they go away. 

I would guess that your students are trying to "ingratiate" themsleves with you by slamming the US.  Instead of talking about the many contributions that Canada and its citizens have made, they chose to tear down the "neighbor".
As for me, usually when I face this situation, I just ignore it (Chinese style) and most of the time it works.  Humor sometimes works too, like when Uncle Sam sells weapons to a particular island and they demand why, I always say that is between Washington and Bjing.
Only once did I have to leave an English corner when one person, who was not even a student at the school, just wouldnt let up. At first I ignored him, but he kept interrupting the studnts and shouting louder. So, I left.
Now, get this! Two days later, one of the student gave me the jerks business card. Imagine my surprise when my student told me that the Jerk wanted to HIRE me to teach his kid English!!!!!

Even though I am Canadian, I went to Uni in the US and have American family, so I will attempt to answer this.
Through years of experience I have learned it is a useless waste of time to argue with ignorent people.  The more you present the facts, the more they dig down and try to rationize their talking points, even though they have no facts to back up their debate.
I would rather just walk away smiling at their stupidity then try to debate them....it's like beating a dead horse.
I will say in closing that they have been brainwashed for their entire lives, so just laugh and feel sorry for their ignorance.
If they knew half the shit we know about China (and believed it) they would have a stroke.

That’s it I am calling myself South African when i go there.

In america, we get the same shit. America-haters everywhere. And we get it from immigrants who CHOSE to come here and born citizens alike. Some do it just to get under your skin, some do it because they dig the drama. I just let them ramble on, if I'm bored I'll battle it out with them, but I love listening to their conspiracy theories. 

What can you do? You either listen, and/or debate it with them, try to educate them, or walk away. What else are you gonna do? Let them boil your blood? Is it worth it? Pick your battles, dear. Pick your battles.

Sometimes I remind them that the USA is comprised of people from the whole planet. I also point out that the largest population of Chinese type people outside of China is in the USA. But yeah, I know when people hate the USA, they mean the hate WASPs, of which I am one.
funny thing is, in other ways they certainly love Many things about America. It's a crazy world....  
I still have the mental image of those Chinese males at that college cheering as the Twin Towers were attacked. I mean, I know they are stupid and reacting in primate fashion, but come on, to openly celebrate the horrific deaths of masses of people??   What a sad statement that was about those boys, their upbringing, and humanity in general.

Sometimes it's good to be Canadian American. I've only had a few who bad mouthed America outright but for the most part they bad mouth everyone

Nobody hates me.   Everybody pretty much likes me, including the Chinese.

Awwww!  I'm so sorry 'bout that.   Well, as I said...... "Everyone pretty much".     You're one of the exceptions I guess.   Come on kchur .... be a lover not a hater.

You would like me if you met me.  Everyone pretty much does.  lol 

LOL 

I noticed that you have 1460+ posts!   Impressive!

kchur......

Do you mind my asking why you are here in China if you feel Chinese attitudes toward you are so bad. ?? 

I'm here because I want to be, not forced to be here, not here because I have to be.  Knowing human nature to be what and how it is (and we're all human), why would you not expect that not all Chinese would have perfect attitudes toward foreigners??     It's only a given that the Chinese would have IMperfect attitudes toward foreigners.  That this would be the case shouldn't be a surprise or a shock.   It's the same everywhere in the world.

I came here expecting and understanding that I would be looked at as being the 'foreigner' and in the minority.  Certainly I am in a very very small minority in a nation of a couple billion people of a different descent, language, and culture than the one that is dear and familiar to me.

Just interested in your perspective on this. 

LOL @ xunlian.  Yes, I have. 

Lived and worked in HK for 8 years, traveling in and out of China often during the 8 years.

Have lived in GZ for 8+ months.  TIme has gone by so fast.  Hard to believe!

At the moment, I'd be inclined just to ask "Did you hear what WenJiabao said?? He reckons China will definitely be a democracy soon, and that it needs to rid all the corruption from its government". Let them chew on that little bit for a while

"How do you Americans deal with Chinese who hate you so much?"

In almost 2 years here now, and as an American, I've yet to experience this hate.  At least directly to my face anyways