Elizabeth Wurtzel, the author of Prozac Nation, is only the latest to answer that question. She states in a LA Times Op Ed "Feminism, which was meant to be fun, has lately started to seem so sour."
Wurtzel has proven with one sentence that she doesn't understand feminism in any meaningful way. To see this all you need to do is replace feminism with civil rights which applies to all US citizens. "Freedom, which was meant to be fun, has started to seem so sour."
Since Wurtzel focuses all her ire at women, it would likely be more accurate for her to write, "Being a woman, which was meant to be fun, has lately started to seem so sour."
Yet for all the women she is sour about, Wurtzel is proud that Katie Roiphe wrote her rape denial book The Morning After. My belief is that a woman is not practicing genuine feminism when she dismisses women's trauma from rape by relabeling it bad sex and declaring that women are no longer victims.
Maybe Roiphe was having fun, and she likely felt liberated when so many people cheered her unfounded attacks against other women, but none of that has anything to do with upholding the heart of feminism.
The reality is that Wurtzel's rant against women sells better if it marketed as a critique of feminism. Without the references to feminism we get an op-ed which begins with:
"Am I the only one who feels that last week's news events prove that women have failed?"