him/her? not really, through I can't say I care much about the gender of Manning, it's really rather irrelevant, it have nothing to do with why she's in prison, and if I was trans, I wouldn't really use her as representant of transsexuality and become angry every time someone mispronounce her gender (in fact I would be happy, because I would hope they didn't connect transsexuality with a traitor).
What the [Inks] is wrong with you?
It' really isn't that big of a deal. Stop looking for reasons to be "offended". Not being massively outraged whenever someone makes the (very understandable, btw) mistake of referring to a pre-op transsexual who was well known as male as such isn't "transphobia". It's a very basic slip of the tongue.
That's not why I'm offended; you're right that that much is completely understandable. (In fact, I think I'm
less easy to offend about this sort of thing than some non-trans posters because I have firsthand experience of how difficult this can be for otherwise unimpeachably tolerant people to wrap their heads around and remember.) What I'm offended by is the sentiment that trans people should somehow be actively
glad about somebody being misgendered (I think 'misgender' is kind of a stupid word but oh well, the word is what it is) just because they're a subjectively unpleasant person.