Who in the world told you your vote for Obama was sexist? I haven't ever heard that particular charge lobed. There's been a lot of discussion about the treatment of Clinton by the media and many Obama supporters and the treatment of Clinton supporters, also by the media and many Obama supporters, but I have never heard anyone say that a person was sexist because they voted for Obama.
I won't accuse you of a red herring, or of latent sexism, but I do have to wonder. Unless you've got a link to when someone said that to you.