I agree that women should get to get their own fun party and not be shut off in an uncomfortable or poorly-located women’s section. But I have a few things to add on why men’s and women’s roles are the way they are.
Besides their traditional all-important roles in the family, women can halachically do a lot of important things traditionally associated with men: study Torah, teach Torah (whether to children or adults), write articles and books, do kiruv, start or lead organizations, have careers, etc. As snowbunny points out, in some circles women can even read the megillah to other women.
There’s a pretty small number of things only men can do, like lain or serve as shliach tzibur or get semicha or count in a minyan. It’s not because men are better. It’s because mitzvos are given to men and women in ways that complement their inner natures.
At some primal level, men need something special to do with other men that only they can do. If men don’t get that from shul they’ll look for it elsewhere, outside of Yiddishkeit. What the experience of the heterodox Jewish movements has shown is that when you say women can do everything to, then the men withdraw and want nothing to do with it, and you end up with a congregation that is mainly female.
So although it offends some people because there’s some superficial inequality, it needs to be this way to keep men involved. Men have a stronger yetzer hara (at least when it comes to things like violence, crime, addiction, gambling and oppressing other people). They need the strong pull of special mitzvos for men, especially those associated with shul, to keep them on the true path.