Answer: Because you're still asking me that question.
"Wait," you say. "You have an entire blog on Joss Whedon. Why do you quote him here?!?" A) Because my love for Joss Whedon is great, and I only post on Let's Get Jossed once or twice a month. B) Because this post is going to be a little bit about Joss Whedon and a little bit more about feminism.
The little bit about Joss Whedon is to say, Joss Whedon frequently kind of stinks at feminism. Yes, he has amazingly strong female characters whom audiences learn to love with a passion. But his "feminist" episodes tend to be very second-wave, elementary, not-complex versions of feminism, and in Buffy especially, his women characters' power overshadows the male characters somewhat frighteningly at times. But, all that being said, this quote is fantastic. It's a great reminder that feminism is still needed in some form or another.
Every time I teach gender issues to my students, I talk through the three waves of feminism. Most people's understanding of feminism is strictly second wave. And often they pick up on the worst moments of second wave feminism, too. They think feminism means "women can't stay home with babies," "women are as good as (subtext: better than) men," and "women can/should have abortions." Many people would be confused to hear me say, "I'm a feminist," and then hear me also say, "I'd love to stay home with my kids when I have babies," or, "I want my husband to be a spiritual leader," or, "I'm pro-life." (Admittedly, some of these people are feminists themselves. I just say they're a different kind of feminist.)
Joss Whedon's failing feminist moments aside, this quotation says something that needs to be heard. It says, "Feminism's battle isn't over." It points out the ways in which culture still assumes a double standard for men and women in the fact that we see a strong female character as something unique and, perhaps, unusual.
I've mentioned the fact that I think that one of feminism's most important battles-not-yet-won is the issue of being able to be a mother and be a professional. I spoke to a professor at Union who said that she didn't think you could be a full-time, 100% mom and a full-time, 100% professor. She also told me that most of the people she's known who have stayed at home with their kids when they were first born have a really hard--or impossible--time re-entering academia. I don't think that this should be the case. I think professions need to make room for women--and men!--who want to work part time and be a parent part time. I don't think that it should work to your disadvantage in the hiring process if you've taken 4 or 5 years off to be a full-time parent. And I think that those who work full-time deserve understanding that sometimes your family comes before your job.
So that's my Joss-inspired feminist rant of the day. Sorry if it's not as rant-y and bra-burn-y as you expected :-)