If that ever happens to me (which it may, because I feel the same way), I will throw logic out the window and start beating the girl up. The dialogue shall go like so:
Random Girl: Manga? That's so dumb. Why don't you read Twilight?
Me: I've read it. It's stupid.
Random Girl: wtf? What's wrong with you?
Me: Nothing. But when a barely-out-of-college girl feels she needs to insert herself into the story, arrive at a random school where no fewer than eighty boys fall in love with her immediately, constantly talk about how not-pretty and undeserving she is, and then end up being constantly saved by a stalker glitter virgin vampire, I'd be a little frightened about her sanity.
Random Girl: *stares blankly, uncomprehending big words*
Me: *slowly* It's...stupid.
Random Girl: HOWDAREUSAYTHATWHATAJERKOHEMGEE.
She would proceed to attack me.
I'd kick her where it hurts, because, while not having the same effect as it does on boys, it still does hurt. I'd then continue to hurt her in any way possible until someone noticed and security showed up.
Even if they thought I started the fight, I wouldn't be sad or scared or anything.
I've done another justice to the world in taking a Twilight hyper-fan down a notch or a half (after all, I doubt they'll ever return to normal), and my mom thinks it's awful too. So if she needed to pick me up at the police station, she'd be like 'I'm so proud of you, honey!'
I read the book for amusement. It was...uhm...interesting.
Renesmee was the bestest. I might change my username. I'm not sure yet. She tried to kill Bella, even though it wasn't intentional. So yeah, she's pretty much my hero =]
Plus, all the police are probably warned now, from all the attacks, to believe the people that were attacked and defended themselves. If they're holding a Twilight book in their hands, especially if it's spattered with blood, they'll be under arrest (hopefully).
So yeah xP