Tell you what, let's try rephrasing Worra's post in a way that cannot possibly be read as likening extreme feminists to killers. Seeing as Worra had a very good point, which has got lost in this bizarre tangent.
How about, some people will refuse to call themselves Catholic, despite agreeing with the core beliefs, because they don't want to be associated with the more extreme view of homosexuality needing to be cured.
Or, my own personal example, I refuse to call myself Wiccan because I don't want people to assume I agree with the more nutty extreme views. So instead, if I have to choose any label, I go for the more general label of Pagan.
So for me it is more like this..
Equalist is to Feminism like
Christian is to Catholicism or
Paganism is to Wicca
While in each of those examples the core beliefs are exactly the same, identifying with the more general label cuts out having to explain to people that you don't agree with the more extreme beliefs.
So rather than me saying "I'm Wiccan but I'm not one of the people who believe fairies faeries exist", I can just say, "I'm Pagan".
And as for the "If you don't call yourself Feminist why are you against equality for women?" argument, it's as nonsensical as saying "If you don't identify as Catholic then why don't you believe in God?". Because it is making an assumption that if you aren't part of a sub group then you can't possibly be a part of the larger group.