How many people would be offended at the statement "white people can't see the colour purple"? Very few, I'd imagine, because it's patently ridiculous.

If you imply that women are inferior though, the statement has to be vigorously opposed. Imply that feminism isn't necessary, and the tumblr and twitter brigades will come out to shame and silence you, until you agree that women have it harder.

It's absurd behaviour for a group of people who supposedly believe women are equally capable as men. Once you figure this out, feminism makes a lot more sense. When they can blame men, they blame men. When fairness requires them to blame women, they blame 'society'.