Pure nonsense. In the (apparently) hostile to women environment that is tech, it makes perfect sense to have women-centric meetups so that women can feel comfortable exploring technology and develop bonds with other women that can help them counteract bias.
What you should be questioning is why there is a need for a women centric event. Dismissing these issues and turning it around to ask why its excluding you (lets be honest here, this is exactly what you're doing) is the only thing morally wrong here.