It's not enough to write the black character "just like" all your white characters, because race is not invisible to most of us and it doesn't have no consequences. In order to challenge people's already racist assumptions about black characters, writers have to work that much harder, and they have to work not blind. They have to work with their eyes open and their brains engaged and with the awareness of subtle signals and context and connotation that anyone who writes for a living should damn well be conversant with. To do less than that is to write lazily, to write foolishly, to write contemptuously of one's characters and one's craft, and to do all that because you can't or won't go the extra mile to bring race into the ... stuff that factors into your writing does, in fact, have racist implications.

Make the appropriate substitutions with respect to sexual orientation instead of race, and there you have it. The visibility of same-sex relationships on TW is a start; now both TW and the New Whoverse in general need more that aren't characterized by doom or psychosis.