I think AOG has interpreted the title of the march ('Slutwalk') as some kind of civil rights march for people who are prostitutes/act like them/dress like them. He appears to be using the example of an alcoholics march to sarchastically/tongue-in-cheek illustrate the ridiculousness of the Slutwalk march, as he sees it.
Unfortunately, it's not very funny (if I'm right of course that that's what he's doing). Because it completely misunderstands the march he's linked to and thus lacks any kind of insight or edge.
The point of the march, as AOG's link quite clearly describes, is to argue that women have the right to dress in a 'slutty' way if they want to without people using that to imply that it's their own fault if they get raped. The implication of what AOG has said, if I've read it right, is that this isn't a message he's particularly sympathetic to, for reasons he has yet to describe.