Your dm and dmil are of the generation of second wave feminists. The fact that your dm challenged the discourses that surrounded her enough to get herself a high-powered education and a job speaks of a fairly strong personality and a high degree of political awareness and determination not to be constrained.
My guess is that they both have a fairly good idea of how far they can push things in their own lives. And, sadly, it looks as though your father and your father in law are that point. It's an old political chestnut that politics becomes very difficult when it moves onto the intimate realm of affective relationships: family, friends, etc. The intimate realm is not politics free - it is politics difficult.
Totally crap that your mother told you not to be too hard on your dh. My mother is/was just the same. I can see why: it just opens a vista that is challenge upon challenge to be supportive of your daughter. Support of you = opening a door onto a series of actions and insights that are inevitably disruptive of whatever status quo those women have managed to achieve in their domestic/affective lives. It really is a world of trouble - the potential gains of which, for them, are rather vague - if existent at all ...
It doesn't stop it being crap, or feeling crap.
Your post gives its own answer, really: as the last poster said - lead by example. It may give them a bit of support in their own relationships (maybe) but it will definitely be good for you - and any other women looking for a good path to follow.
And I am really sorry to hear that it sounds like they are drawing back from seeing you so much. I very much hope it resolves itself. Could it be just age? My mother doesn't visit us at all, and doesn't like us visiting - but this is (apparently) something to do with her age (rather than my father being difficult).