I come from the Black community where gender roles have always been very rigid, despite what it may look like to an outsider. It's still difficult for Gay Black kids to come out and be fully accepted by their families, especially if they're religious: most of the Black churches are as homophobic as ever. I can see butch girls or nelly-acting boys feeling a lot of pressure to change. Gender transition might appeal to them as a way to conform to expectations; although, as we know, there are people who would never accept their transition as valid. They'd most likely find themselves ostracized in a different way.