Using female as a noun can be bad, but is it "permaban the user and criticism and locking the thread bad?". Options would have included: removing the post, which wasn’t done, handing out warnings or temp bans, or even just calling it out in a mod comment.
Personally, I read that use as intentional in the context of the image: These titles are written from the perspective of the person in the image. The person depicted was trying to objectify a woman. Objectifying language might be appropriate since that person saw an object of desire, not a person.