If the politics of Deleuze and Guattari seem implicit or are lost in their rhetoric then Brian Massumi comes across explicitly. Here are some quotes from his 'Introduction to Capitalism and Schizophrenia' book about gender and singularities:
"Man" and "Woman" as such have no reality other than that of logical abstractions. What they are abstractions of are not the human bodies to which they are applied, but habit forming attractors to which society expects it bodies to become addicted.' (p86-87)
'No body is "masculine" or "feminine"' (p87)
'A body does not have a gender: it is gendered' (p87)
'Gender is a form of imprisonment, a socially functional limitation of a body's connective and transformational capacity' (p87)
'The ultimate goal, for Deleuze and Guattari, is neither to redefine, misapply, or strategically exaggerate a category, nor even invent a new identity. Their aim is to destroy categorical gridding altogether, to push the apparatus of identity beyond the threshold of sameness, into singularity.' (p88)
From reading through Massumi's Deleuzian politics and the quotes specifically the main attack is set against the system of the general (the category) and the particular (the entity). It is not that Deleuze and Guattari don't see benefits of feminism, where they argue for a becoming of women in A Thousand Plateaus, but is just that they want rid of categories that are abstract and try to code behaviours of particulars that are 'members' of a general category. This is why Deleuze and Guattari view language as prescriptive and not referential, where someone can say 'its a boy!' as a means of using particular bodies designated for the general categories. For Deleuze and Guattari each species and each body is a unique singularity, and such designations of 'male' and 'female' should be destroyed in favour of realising each singularity undergoes and obeys far more complex rules of formation. In short, each singularity undergoes its own highly individual historical formation, which the logic of the general and the particular fails to recognise. While Deleuze and Guattari do understand gender does play an active role in todays' society, they argue for an ethics that opposes the general and the particular as they feel these are systems of over-coding and determinism.
Deleuze and Guattari do not argue this from a social constructivist position, as Manuel DeLanda makes clear in this public lecture at the European Graduate School.