Because it's a passive statement meant to cast aspersions on feminism as a whole by associating the movement with these hypothetical feminists you speak of, while at the same time citing no evidence whatsoever to back up the statement. It's a typical tactic used for demagoguery and yellow journalism, allowing the author (you, in this case) to make an inflammatory statement without having to take credit for originating a ridiculous idea that most of the time can only charitably be considered anything but an outright fabrication.