Wollstonecraft cannot be seen as anti-feminist, because she counsels women not to be soft-spoken. She does not have an "extreme hatred" for soft-spoken women, but she does say in her Vindication of the Rights of Women that "soft phrases ... delicacy of sentiment and refinement of taste" make women seem weak. By acting compliant and being soft-spoken, women arouse pity in men, and that pity eventually turns into contempt.
Wollstonecraft, instead, wants women to be strong, both physically and mentally. She decries an education system which she argues equips women only to be simpering and emotional second-class citizens. As a believer in Enlightenment ideas, Wollstonecraft thought that "nurture," rather than "nature," formed women and that the right education could help set them free; she believed education in both men and women should equip them as rational beings and that women should be taught to be the companions of men rather than simply their wives. By advising women not to be soft-spoken or weak, Wollstonecraft actually reveals her strong feminism: she does not blame women for the way they are, but wants to guide them toward a mode of living and being that will lead them to greater happiness.
It is important to remember that Wollstonecraft's ideas about educating women were considered far more radical in her time than today.