It's a division of the international working class into sub-groups that are then pitted against one another. If you take the perspective that racism is used within a country to divide the various groups of workers up into identity groups that are then made to fight one another internally it is the same tactic but at an international scale. Skin colour and sexuality as identity groups is just substituted for national flags as identity groups. Same old story, divide the working class up to fight each other, and rule them.