Inter-ethnic/racial bigotry is unfortunately, nothing new. For instance, my current neighborhood historically has had a large Italian-American population.
However, they tend to strongly disassociate themselves from other Italian-Americans in neighborhoods like the pre-late '90s Bensonhurst/Dyker Heights, Staten Island or Ozone Park due to a combination of SES differences and where in Italy they originated*.
- Ones in my current neighborhood mostly originated from the more prosperous areas of Central and Northern Italy rather than Southern Italy/Sicily.