The term feminist does not
mean "Women are better, men are pathetic scum of the earth". It means that women are equal to men
and that we should have equal rights and fair treatment. It's been hijacked by people who don't read and learn in order to actually know what they are talking about.
That being said, I'm a feminist, my entire family (on my side, not my in-laws) is 100% feminist and I know many men who are feminists. They want women to have equal pay for equal work, equal rights, fair treatment, equal representation in government, etc. in order for there to be real balance in the world.
If a woman spews hatred toward men, she is misguided and lacks eloquence. She is also more than likely to be frustrated with living in a patriarchal society which values her as a commodity for men. But instead of demanding equal rights and fair treatment, she spews hatred because she doesn't know better. It's inexcusable. It also trivializes and undermines what she and others want.