This exemplifies one of things I hate the most about fats - they insist on taking language associated with legitimate discrimination issues and trying to apply it to themselves. They did it to gay people (talking about "coming out" as fat, comparing fatness to gayness), disabled people (by talking about "accessibility" and corrupting the body positive movement) and now, they're doing it with race/inter-racial relationships. There is no such thing as a "mixed weight" couple because weight is not an immutable characteristic - weight can change. Race does not change over time. Also, there were never actual laws on the books banning fats from dating thin people. Interracial relationships were a CRIME in the US at one point. They are desperate to associate themselves with legitimate justice issues because they know how hollow their own cause is.