>>507403210 (OP)Roman Empire jealousy. Your people conquered Europe, and everyone hates the people on top.
Catholic issues. The Pope was Italian for long periods in the Middle Ages. This associated your entire culture with the corruption in the Church after the black plague.
You joined in Napoleon's destruction of the aristocracy. The Italian Republic.
Italians are loud and expressive. Large portions of Europe are culturally robotic and bordering on emotionless. Germans, Nordics, etc.
Mafia.