Why do american trolls rage against sicilians so much?

There are very few Sicilians in total, so there is a small chance of them meeting a Sicilian in real life, and there is a perception that the Mafia is a Sicilian concept as the only idea most Americans have about them, so since they aren't afraid of the Mafia Sicilians seem a good target. If you were forced to choose a target of racism, wouldn't it be better if you chose such a small minority it was unlikely it would ever matter?