Someone who believes in equal rights for men and women. Some people call themselves feminists or think they are but actually aren't, and in fact seriously think women are superior to men. However, that isn't very common, but many men and women online have somehow fooled themselves into thinking
feminism is some great conspiracy and
sexism doesn't exist. Certain aspects of
feminism are controversial even within the movement, but the basic idea is still equal rights for both/all genders.