By definition, feminism is "the advocacy of women's rights on the ground of the equality of the sexes."
I'm not sure why anyone would disagree with that unless you're on a power trip.
However what I will say is that often the word "feminist" gets used for women who want to topple male dominance ... that by definition isn't feminism. That is also a power trip.
So on the surface, I have no issues with it, but much like anything it gets twisted and manipulated by those who want more.