So I have a question then. Is the term 'national traits' simply a euphemism for stereotypes?
I tend to think that stereotyping is highly dangerous, and I view people as individuals rather than as being from any particular nation. That being said, I'm often quite alarmed at how closely people match (I guess the Cdn perception of) national stereotype. I live in an area that attracts many international tourists, and I have worked in the tourist industry. I am at the point where I can tell where somebody is from just by the way they act and look even before they give themselves away by speaking. So what is going on here? Do people adopt a certain set of behaviours while travelling, sort of a cultural signifier that is broadcast to those of the same group? Have I, at a subconscious level, picked up on national clothing preferences and such ?
I can't help but wonder if the cliche about "no smoke without fire," holds at least a little validity. Discounting stereotypes that arise from bigotry, is it possible that some stereotypes develop from a small kernal of 'reality' (however one might wish to define it) and then become grossly amplified and distorted?
Though as CM observes, different nations hold contrasting stereotypes of the same groups. I would say that this is very true, and I'm guessing these stereotypes are shaped by experience. In Canada, perceptions held of the US are similar to those in Europe (but interestingly they are as much fueled by insecurities over national identity). To me, the Middle Eastern stereotyping of the average American makes a great deal of sense.... just look at history, especially the recent past.
Similarly, Canadians are frequently paranoid about national identity, they usually don't know if they want to be more influenced by the old colonial power of Britain, or the newer American one.. or if they actually want to develop a uniquely Canadian image

I can also say, given my own European background, and the fact that I've travelled extensively in Europe, that many Europeans like to sneer at Americans.. so again, the resulting stereotype is hardly surprising.
note: I say "Europe" here because in my own case, my background is composed of several diffent countries, so it is easier. I am clearly aware that Europe is made up distinct nations and cultures. If I appear to be generalising, I am referring to those countries with which I am most familiar: Holland, Germany, France, Norway and the UK. Many people I have encountered in all of these countries view the US with considerable disdain.