I think people need to take a step back from the vitriol and realize the irony in @deadgirlwalking's statement about wanting to claim being white when they are black.
At the core, trans men / women identify differently from their gene or cellular biologics; this is fundamentally no different than someone black / white claiming to identify differently from their gene or cellular biologics. If you are OK with one, you must and should be OK with the other...
I think the reason why @deadgirlwalking is having such difficulty with this 'showerthought' is because it hits home for them in a different way.
Don't think about the centuries of slavery and racism @deadgirlwalking 's ancestors endured, no... think about the racism that PoCs endure today, yet its relatively less socially divisive for men / women to be something else.
I think delivery was wrong, but there is a powerful message in the discussion of this 'showerthought' ...