The fact is....what Rachel is after....she won't get by saying she's transracial.

The main reason I think most of us object to this is because we don't want a white person to attach themselves to the experience of being perceived as black growing up. In certain environments (ie the social justice world)....being perceived as black carries currency. And we don't want white people getting that currency because they didn't have to go actually live those experiences in order to get it.

But if someone claimed to be transracial....they wouldn't get that currency. So it takes away the motivation of someone like Rachel. She's doing this whole thing to absolve herself of white privilege. Claiming to be transracial doesn't do that.