Yes, as colditz says, think of clever quips to use in situations where someone says something desperately stupid. Okay, there will be times you feel the need to bite your lip, but there are plenty of times when you can make a stand. Maybe think back on what you might have said or done differently in situations that pissed you off in the past. That's sort of a rehearsal for situations in the future.
Someone calls you a man-hater? So flipping what? Folks who genuinely care about you, know you and respect you will value you for what you are. Others, well, do their opinions really matter?
If you have "acquaintances," colleagues, family members, etc., who are bigoted fools and wind you up, avoid them as much as you can. Heck, plan you life around them or work them out of your life because well, you could be cultivating useful connections with people who aren't idiots, who add good things to your life, not suck life out of you.
And, it's always worth doing something, anything, that might make a difference. Volunteer as a mentor to young women, at a women's refuge, supporting elderly people (most of whom are women), anything that will bring benefit, opportunities, support, knowledge, empowerment, etc. to women. It can be fun as well as make a difference. If you aren't able to do that, there are other ways - circulating e petitions, writing a blog, even just reading about stuff that expands your mind, and validates what you believe (especially of many around you are rubbishing that.)
I've only been on MN for a few weeks, but it seems a good place for learning, stretching the mental muscles, finding out about campaigns and current events and that all important reinforcement that you sometimes need when stuff in RL seems stacked against you. There are other blogs and boards like that as well if you look around.
Stick to your guns and more power to your elbow/keyboard!