When I think that line you've quoted shows the problem with the blog post. She's picked up entirely the wrong end of the stick. Sarah Ditum was not saying women are identifying as feminists to attract men (has that ever worked? 
), quite the opposite. I reread the Sarah Ditum piece and it's hard for me to see how anyone can come to that interpretation.
When's wardrobe reminiscences remind me of a time a million years ago when I was working in a cafe. I was asked by the manager to stop wearing very short shorts (them were the days) because although (in his words) I wasn't wearing them to look sexy 
, another girl was wearing the same shorts but her look was too sexy. I still can't figure out the precise location of the offence I felt after this encounter. I wasn't trying to look sexy (and was apparently succeeding) but still...
There isn't really a point to this story except that it seems like the "cool girl" feminism (and this blog writer) is saying "we own slutty". We don't. Society, and particularly patriarchy, is a framework for our actions and choices and how other people perceive them. The fact that she feels she has to tell us precisely how we may use the word "slutty" towards her speaks volumes.