Ex. Germans precise and dominating, the French lovers and bad at war, Or the English having bad teeth?
Can I ask in what country is it a stereotype that the France are bad at war? It seems like one of the most counter-intuitive stereotypes ever.
Nope. Depends on the time & who's stereotyping whom. Here are a quick sample of posts that turned up when I searched "stereotype" to give you an idea. There are tons more out there about specific stereotypes (e.g. "When did "German engineering" become a thing?") or vague questions like "How were x regarded by y".
Ancient Greeks, Ancient Romans, "Barbarians"
French
British
Russians
Germans
Redheads/gingers
The question must be quite unanswerable, because always also implies the contries have always been the same. Germans haven't been a unified nation for that long, England have had quite segregated social groups (Saxons, normans ... the list goes on) during different times of history. Dental hygiene was overall bad everywhere during the middle ages.
If you specify your question you might get more answers. Do you mean during modern times?
William of Malmesbury, an English historian in the 12th century, wrote a somewhat famous passage around 1120 on how all peoples of Europe answered the calling of the Pope for the first crusade where what appears to be stereotypes appear.
He writes: "The Welshman left his hunting; the Scot his fellowship with lice; the Dane his drinking party; the Norwegian his raw fish."
I don't know about English stereotypes of the Scot and the Welsh, but Danes are still known for their drinking and, at least in the Nordic countries, Norwegians are still known for an indulgent consumption of fish. What's more striking is the barbarization of the northmen, a stereotype I don't think has any presence in the modern world outside of nostalgic history.
The passage is cited from this edition on Google Books.
In the context of economic history, a fairly longstanding claim has been that culture is a proximate determinant of development - cultures that value hard work, honesty, innovation and creativity will become rich and those that don't are destined to remain poor until their cultures change. David Landes' The Wealth and Poverty oF Nations is a good exemplar, though you could go back to the bastardized version of Weber's thesis on the Protestant work ethic if not further.
Ha-Joon Chang presents a number of very interesting counter-examples (link is to an excerpt from his book Bad Samaritans), focusing on Anglo-Saxon views of German and Japanese culture before they took off in the early/late nineteenth centuries. E.g., the British on Germany:
Before their economic take-off in the mid-19th century, the Germans were typically described by the British as “a dull and heavy people.” “Indolence” was a word that was frequently associated with the Germanic nature.10 Mary Shelley, the author of Frankenstein, wrote in exasperation after a particularly frustrating altercation with her German coach-driver; “the Germans never hurry”. It wasn’t just the British. A French manufacturer who employed German workers complained that they “work as and when they please”.
The British considered the Germans also to be slow-witted. According to one John Russell, a travel-writer of the 1820s, the Germans were a “plodding, easily contented people … endowed neither with great acuteness of perception nor quickness of feeling”. In particular, according to Russell, they were not open to new ideas; “it is long before [a German] can be brought to comprehend the bearings of what is new to him, and it is difficult to rouse him to ardour in its pursuit.”. 13 No wonder that they were “not distinguished by enterprise or activity”, as another mid-19th century British traveller remarked.
Germans were also deemed to be too individualistic and unable to cooperate with each other. The Germans’ inability to cooperate was, in the view of the British, most strongly manifested in the poor quality and maintenance of their public infrastructure, which was so bad that John McPherson, a Viceroy of India (and therefore quite used to treacherous road conditions), wrote, “I found the roads so bad in Germany that I directed my course to Italy”.
Western notions of the role of "Confucian values" in the take-off of the East Asian tigers and China have similarly changed dramatically in the last 30 years - see the chapter for more.