This is a derogatory phrase and should never be used. The U.S. Equal Employment Opportunity Commission (EEOC) has written specific rules that protect people, mostly immigrants, against employment discrimination on the basis of their national origin. The agency is responsible for enforcing laws that prohibit discrimination and harassment based on race, color, sex, religion, national origin, age and disability.
In Belgium, the antidiscrimination law applies to combat discrimination at the workplace.