Arguably 'grammar Nazi' isn't an appropriate term either - comparing those who appreciate good English to war criminals. However, such people aren't part of a group that have been historically oppressed, whereas feminists are, so using the 'Nazi' label to criticise feminists very much seems an attempt to shut them up and send them back to the kitchen - if you ask for equal rights we'll call you Hitler.
Grammar Nazi is fine; I think you take these things way too seriously and think way too much about things. Anyone who finds the term Grammar Nazi offensive really needs to see life a bit more, I think.
Feminazi is a term for those feminists who are nutters, who have taken things to such a ridiculous extreme that they have given true feminists a bad name - and as a man who supports true feminism, I hate that fact.
Hey, and whisper this quietly, fella...there are plenty of women out there who hate the feminazis too...yeah, true fact.
Once again you're making assumptions, which is something you say you don't like. I'm not offended by Grammar Nazi or even by Feminazi, and I'm certainly not upset. I actually don't particularly care about any of these things, I'm just giving an opinion. I have strong opinions, but very few of them have an emotional component to be honest.
Anyway. Yes, I know a lot of women are anti-feminism. More than 50% of misogynistic posts on Twitter are by women, apparently. I think that some women don't like being told the they should have careers and don't have to have children or get married etc., and they don't see feminists as role models for that reason.
The reality is that women should have the choice over what to do with their lives, and not have it dictated to them; not by men OR by other women.