Fuck it, I left the feminist movement.
Do you believe that women should have equal rights to men? If the answer is yes, then you are a feminist, because that's all that feminism really is. If you fight for the rights of all humans, that includes women, which means you are a feminist. You can be a feminist and also support equal rights for all people. Most people are feminists, they just don't like the label because the extremist man-hating feminists have hijacked the term. I highly recommend watching Emma Watson's speech to the United Nations.
The problem is people use the word for everything, you are doing it now, saying that all humanist are by definition feminists, overusing a word for the sake of the word rather than giving the right message only causes the word in question to deteriorate any substance or meaning it ever held. Also, the word "feminism" doesn't holds any intelectual right of exclusivity over the concept of equality among the genders, there's another word which is egalitarism, although many prefer the social prestige that comes with the feminist(tm) label, or at least that was before the term was bloated with all kind of nonsense.
"The problem is people use the word for everything, you are doing it now, saying that all humanist are by definition feminists"
I'm only using it when it matches the definition.
Feminism: the doctrine advocating social, political, and all other rights of women equal to those of men.
Feminism and masculism are both subsets of egalitarianism, just like blue and green are subsets of color. My argument was no different than saying, if you like every color of the rainbow, then you like blue, because blue is a color of the rainbow. Similarly, if you support equal rights for all people, then you support equal rights for women (feminism) and men (masculism).