I could honestly forgive Shannon's aversion to cellphones if it weren't for the comment about her friends dying from brain cancer. On it's own, it would've been just a quirk. An annoying, stupid quirk, but nothing that ruins the character.

But that aside makes Shannon look like a colossal asshat. Worse, like the lovely heroine who takes after her, she looks like the alpha bitches PC loves to tear down. And I'm supposed to be rooting for her?