For example, whenever he posts something, if this is something relevent, read it and feel free to post your response. If this is something totally unrelated to this forum, or irrespectable of women, then ignore him.
I mean IGNORE him. Don't respond, even with negative words. A negative response would send him the message that he's getting attention here. I think he secretly relishes girls' attention, whether you are nice or nasty to him.
If he's posting good posts, of course, we should respect his contribution to this forum and post your response in whatever way.
This way, we can curb his undesirable behavior.