What we really have to note here is that hostility from outside promotes internal unity.
Back in the day, societal hostility was more intense. This drove the LGBT community to overlook differences among us, for the sake of unity.
Today, with growing acceptance from society, LBGT coalition is starting to come apart from the inside.
Gay men and lesbians never had much in common, besides societal antipathy. Gay men are about sex, and lesbians are about relationships. Both groups think Bisexuals are dabblers, and none of three groups understand transgender.
There is a great deal of misogyny amongst gay men, and many lesbians are man-haters. This gives both groups reason to dislike transgender. Many gay men see us as women, and many lesbians see us as men. Then, if we are bi or gay on top of being trans, that throws even more people for a loop.
In the future, we have to be prepared to be excluded from the gay rights movement, which will probably splinter into seperate male and female movements.