I know the conversation has kinda since stopped (damn time differences) but I want to thank Colleen and skjerva, and Clovis and FroHam, for some great discussion. And thanks for having it here, where I'd find it, and not in a spoiler thread I'd be avoiding because I haven't seen the movie because it hasn't opened here yet.
It's funny, skjerva's not the first person I've heard call (500) Days heteronormative. I think Colleen also did great work at pointing out why this can be, but isn't necessarily always, a problem.
I'd just also like to say that a year ago it's stuff I probably wouldn't have noticed, but now, I've been getting incredibly sensitive to it. Like in The Hangover, which offended me in so many ways, although I'm pretty sure a year ago, I wouldn't have noticed.