Just in the US because most of italian americans are from the south (not the most progressive or open minded people exactly) and well... also because growing up in the US can make anybody to have really serious racial/identity issues. Most of the Italians that came to South America were from North/Central Italy and most of them didn't have problems to mix with natives/blacks/whatever. I know a lot of people with Italian surnames whose phenotypes go from Dinarid to Zamboid. And Southern Europeans are not more racist than any other people, they are just less hypocrital than anglos/germanics.