I don't think anything in what she wrote made her sound "upset." It's all pretty reasonable, straightforward and easy to understand even if you don't agree with it.
I think some people are too defensive and take Anita's opinions, which is really pretty basic and not inflammatory, way too seriously.
I think it's just her general phrasing and the fact that most people only really hear what she has to say through Twitter which makes it seem like she's saying that things aren't good enough.
I also think that her anti-violence rant recently turned a lot of people off to her criticism and really hurt her true goals and commentary being accepted.