Maybe get one of those T-shirt iron-on transfer design programs and make some affirmative male message shirts to wear. I'm not sure you have anything to gain by sinking to negative bashing.
Maybe you and your band could build a little home-made silk-screen set-up, settle on a male-friendly affirmative slogan and have several shirts apiece made for each of you (to make it cost effective). If you made a bunch of t-shirts with an affirmative message and your band's name, you could make it a publicity gimmick to give one shirt away a night (maybe challenge someone to come up and sing karaoke style). If you do this idea, only do x-lg, xx-lg, xxx-lg shirts. People will gladly take a larger sized shirt.