Actually, the whole thing is a metaphor of course. You have to think beyond the absurdity.
Off the top of my head, it's a reversal: objectification of men, reduced to their sexual organ, much like women are often reduced to their breasts and vagina.
Men will say "I'm more than a dick!" and that these girls are horrible.
Well, you see: women are more than boobs and vaginas.
The statement in there is probably deeper and more multi-layered than you think.