I am a redneck Christian with a strange sense of humor. I’m not a bigot. We are all a blend of different nationalities.
That said:
I once wrote a short musical about a Jewish family living in an Italian neighborhood. They decided to sell their own kosher pizza, shaped as the star of David.
The music was inspired by the slur used to identify Italians, many years ago, which sounds exactly like your heading. Needless to say, their business was poor....
I know a Japanese girl who was raised in a predominantly Italian neighborhood. She isn’t Japanese anymore. Her personality is that of Italian. Hands are always moving when talking, very expressive and articulate. Very short and hot-tempered, etc. :-)