I find the charge ironic because I have a great deal of trouble thinking of anything substantive that all feminists believe. After 20 minutes of careful through, and some non-trivial assumptions, I've come up with exactly one:
Most, and possibly all, cultures around the world today are sexist.
Note, for the first, that I haven't defined sexism. This is because I don't believe there's any feminist consensus on what sexism is. While feminists do agree that sexism is a problem, there's no agreement on the nature of the problem, much less on particular policies that will improve things.
With some significant assumptions, it's possible to come up with a second:
There should be some legal guarantee preventing the government from interfering with a woman seeking a voluntary abortion during the first six months of a pregnancy.
But since I know, personally, at least one woman who's a dedicative progressive and devoutly anti-abortion Catholic, the assumptions needed to get consensus around this claim are dubious at best.
Now, it would be easy to come up with many more -- the sky is blue (generally), chocolate tastes good, snow is white, puppies are cute, and other inanities. But none of these is characteristic of feminism or feminists. And in no case do we have clear feminist agreement on whatever policy proposal you don't like and want to blame on `The Feminists'.
Unless I'm leaving something out. Can you come up with anything?