Ughhh, I have one of these in my house. Has a Tumblr, reblogs all the "sapphic suggestions" posts and everything. I think she took that one post along the lines of "lesbians, your gaze isn't creepy or fetishistic like the male gaze, it's ~empowering~ to ogle women!" way too close to heart, because now she's uncomfortably open about which of her friends she wants to bang. Which is all of them. Including her cousin.
She's also very blatantly bisexual, but gets visibly offended when someone tries to call her on that fact. She always has some kind of excuse as to how it "doesn't count", like how she really likes slash for the gay representation, or how squealing over how cute your male friends are is just something people do platonically. Or like this conversation from the other day:
"I actually have more crushes on male actors than actresses, you know why that is?"
"...bisexuality?"
"Because movies barely have any strong female role models."
"...maybe you just need to watch better movies, dude."
I dunno, it's not much more than a mild irritant, but I just hope she'll grow out of it sometime soon. It's okay to be gay, but chill, goddamn.