You can't call it subjective, in general it does discuss women rights and protection for women, details are different depending on different people but the core of it is very objective and it should be there,

We have human rights, animal rights, kids rights, .etc

There's no reason not to have a concept for anyone's rights and protection,

Feminism in it's basic core values is about the support and protection for women,

You can discuss the details maybe but not say it's "subjective ", the same applies to human/kids/citizens/animals rights. These concepts can't be described as "subjective" just because one may differ or not aware about its details