on the question of what is oppression - I think if someone is unable to ezcape from a situation, even if it is fairly low level discrimination, then it is oppressive. For example, if I have a bad employer but I can change jobs, that isn't oppression. If I live in a society where women are paid less than men (around 80%, depending on stats) then it doesn't matter where I work, I will have that discrimination, so that is oppressive.
Sadly, we DO live in a society where women earn less than men (comparing like with like for qualificationes, experience etc), so it IS oppressive. I hate that I have to fight hard to get the recognition I need at work, that it is assumed that I have the 'second job' etc.
And as we do live in a society that treats women as secondary to men, then the onus should be on men to correct this. We don't expect victimes in other situations to fight their own battles, why do we expect women to do this? The civil rights movement wasn't saying that black people in the US needed to change. It said that black people could and would be equal, and that white people had to instigate the changes to make it happen. Men hold more power and wealth than women, therefore they have the means to instigate changes. So if they aren't trying to bring about change, they are passively allowing opression and discrimation to continue - they ARE part of the problem.
fwiw - in US Congress, men who have daughters, even Republicans, are more likely to vote in favor of equal rights legislation for women than men who don't have daughters. In other words, once men see it affecting their own children, they start to see the inequality. Until then, an "I'm all right, Jack", mentality prevails.