Earlier quoted context omitted.
Feminism is not to blame. Feminism is wonderful and empowering ideology. There is a distinct difference between the ideology of feminism and the behavior of a specific group of feminists. Lumping the two together like that is like blaming Islam for terrorists.
Feminism, by its very name, is a sexist philosophy. And according to feminists, sexism (mainly patriarchy) is bad. Unless it's feminism. Feminism -> Feminine -> Female Definition of -ism: a distinctive practice, system, or philosophy, typically a political ideology or an artistic movement.
Your argument presumes an inference of the definition from the etymology, which would perhaps not be an unreasonable approach if you were a future archeologist stumbling on the fragmentary remains of our society and the only information you had for interpreting the modern English word "feminism" was an idea of its linguistic roots.
But it is unreasonable when you actually have access to the modern world in which it is used.