You might want to actually read that wikipedia post.....
"The slang term Guido is used in American culture to refer derogatorily to an urban working-class Italian or Italian-American male who is overly aggressive or macho with a tendency for certain conspicuous behavior.[3] It may also be used as a more general ethnic slur for working-class urban Italian Americans.[4]"
"The slang term Guido is used in American culture to refer derogatorily to an urban working-class Italian or Italian-American male who is overly aggressive or macho with a tendency for certain conspicuous behavior.[3] It may also be used as a more general ethnic slur for working-class urban Italian Americans.[4]"