Surely the point here, as Michael says, is that feminism and anti-sexism (or whatever better word anyone can come up with) are two different things. Feminism implies wanting consciously to strengthen the the rights of women vis-s-vis men. (So far as I know, there is no male equivalent - 'masculism'?). Anti-sexism on the other hand implies wanting there to be no unfair privileges for either sex (or perhaps I mean 'gender' - 'anti-genderism'?) over the other.
(Must stop now - I can see the post person coming through my front gate with my person.)