This is done for economic reasons as well as simply out of ignorance. Anarchists don't believe in 'master races' or in Manifest Destiny or any ethnocentric creed that puts one group over another. Sexism crosses over race and class lines, and is one our oldest societal wrongs. No one is the property of anyone else. Women are not inferior to men.
Anarchists consider their women comrades equals, the way they consider everyone.
This was put into practice in the Spanish Civil War when women fought alongside their male comrades on the front. There is a group within anarchism who call themselves anarcha-feminists who seek to bridge the gap between anarchism and feminism. Naturally, in our acceptance of the equality of humankind and our rejection of authority and government, we of course recognize and respect the rights of people to love whomever they choose. In this respect, members of persecuted religious groups would profit by recognizing the validity and utility of holding anarchistic beliefs as well. Recognizing that humans have a right to live, we naturally oppose the manifold human rights abuses levied by authoritarians upon dissidents and others who stand up to illegitimate authority.