As an example... for my wife, her salary was depressed because her boss thought that I make good enough money that she doesn't really need it. I think a lot of women still receive extremely slanted peer reviews due to gender biases (she's really catty, while he tends to raise good arguments), relationship drama (I mean, she's a good worker, but she turned down a drink with me... I don't know how good her judgement is), straight up appearance judgements (Oh, don't give the raise to nancy, she'll have a cushy life with looks like that, barbara could use it more), and harassment (I don't know about that raise - hey what are you doing friday?).

I think that everyone feels like we've totally solved gender discrimination forever while it's still really deeply seated in our culture.