Why do women refuse to acknowlegde discrimination against men?

It seems whenever there is something that they even think would be discrimination against women, they start screaming, but they don't ever seem to care or even acknowledge all the discrimination against men (The Selective Service laws, only men are forced to sign up, Affirmative Action, women getting more lenient jail sentences, biased family courts, biased ault laws, and all sorts of other double standards) What's up with that?