It's great to see that, in recent years, the world has been taking sexism seriously again, after a hiatus of several decades. Discussion of the topic is totally mainstream nowadays, unlike just 10 years ago, where you'll find such discussion often restricted to particular circles, with the question 'is feminism irrelevant now' more likely to be found in mainstream discourse.
Smashing sexism, once and for all, should be a team effort. We should all be in it together. And we need everyone to participate passionately too. Things like smashing the glass ceiling and ending domestic violence are difficult long term campaigns that require a whole of society effort. In light of this, Emma Watson's invitation of the boys to come on board was really inspirational. We should all do something similar whenever we can.
On the other hand, political division would be unhelpful for the team effort. I know we are all passionate about some things, but you really don't have to agree with a certain brand of politics to be part of team smashing sexism. Some feminists strongly believe in affirmative action, but the more libertarian among us find that idea suspect and prefer we get there on merit. It's okay to have differences like these - affirmative action or not, it should not distract from our common goals. Another good example is differing views on abortion. There's the debate between pro-life feminists and pro-choice feminists, and even amongst the pro-choice there's the question of whether it should just be 'safe and legal' or 'safe legal and rare'. Again, this just mirrors the general political debate on the topic, and should not be a cause to disunite us.
Smashing sexism is a team effort. Don't let our personal politics get between us.