Given that "LGBT" is basically a bunch of very different groups all lumped together solely because they're not straight or cis, it's not surprising in the least that there's a bit of internal friction. If anything, I'm surprised that there isn't a hell of a lot more of it.
There is a shitload of internal friction though. There's the 'gay men aren't
really oppressed' shit, there's biphobic "if you choose to be in a het relationship you're betraying the cause!", there's "
Drop the T"
And that's just from the four most accepted letters. Arguments about LGBTQ vs LGBTI vs LGBTQIA vs whatever else, does kink belong, does poly belong, do straight HIV+ people belong...
Coalition building is hard. I'm convinced we are better off fighting together against our common enemies, but that doesn't mean we'll get along wonderfully.