Butler has a way of cutting straight to the crux of the matter. This is indeed the rub: MP want to talk about the structures of subjectivity (probably because that is the def of phenomenological method, which he hasn't questioned) but the lived body is necessarily particular and concrete, since it is "mine."
I don't know if there is a way to improve on her clear and concise formulation.
The contradiction at the heart of his text is this tension between the abstract subject and the concrete lived body. Universal and particular. We are back to Plato's forms and the problem of communication....
As feminists, do we want to reject the project of finding structures of subjectivity - that is structuralism writ small -- and fully embrace or promote the particular, situated, lived body? Is that the agenda? One agenda?