"The theory of the political, economic, and social equality of the sexes" is not the sort of thing that I feel should have a word for it. So I prefer not to identify as "a feminist" on those grounds.

I am perplexed by this statement. Do you mean that discrimination is always wrong, and so we don't need words for persons who are against particular types of discrimination? Would you therefore also object to the word "abolitionist," for example, if slavery were still a current issue? Or "suffragist"? I'm really just speculating here; maybe you mean something completely different.