Every nationality has it's stereotypes. Unfortunately there are just enough people that fit each stereotype to make it difficult to state that the stereotype is totally wrong. After all - that's why they arose in the first place.
But the rest of us are also aware that many, many, many, more people don't fit that image.
Think of the stereotypes of Aussies.
Bronzed, beer-drinking, meat-pie eating, (real)football-loving, slow-talking etc etc.
We will all be able to say - yeah I've met the stereotypical (name any country here) person.
But there is no need to get stirred up about it - I laugh when people tell me I am (or am not) typical. I invoke the typicality when I feel like it. "I'm Australian, of course I can drink beer/swim/play tennis" "I'm Australian, of course I grew up riding horses" etc. Not every Australian can or does do these things (and my tennis is terrible!!), and we all know that logically.
I met what I would call 'stereotypical' USAnians, Germans, French, Israelis, Italians etc. I have met people who match some of the criteria required and are totally different in other areas, I have met people who have NONE of the traits.
But it is easy to get defensive about the negative sides of stereotypicality, and unfortunately, it is impossible to say it NEVER happens or has happened.
Make people lose the image by your own actions.