Traditional Culture Encyclopedia - Traditional festivals - Can you explain in detail the differences in cultures reflected in this joke?

Can you explain in detail the differences in cultures reflected in this joke?

Englishman as a policeman: Englishmen are more impartial? (not sure)

French as chef: French food is very famous (but I recommend Chinese food)

German as mechanic: Germans are scientific and rigorous

Italian as a couple: Italians are more romantic and sensual

Swiss as manager: Switzerland is good at management, the most famous hotel management education is in Switzerland

German as policeman: There was a Nazi who had a good reputation for his management education

German as a policeman: There was a Nazi who had a good reputation for his management education. Management education seems to be in Switzerland

Germans do police: once out of the Nazi's country let people afraid

British people do chef: allegedly the British meal is the world's most humble, difficult to eat

French people do mechanic: sensibility is greater than rationality?

Italians as chief stewards: sensibility over reason?