Folkies, broadly defined as performers of acoustic-oriented music, are a lot less homophobic than the public at large. However, I think that there is a lot more acceptance of lesbians in acoustic music than of gay men. There's a whole subset of lesbian musicians who've attained mainstream success, but not too many gay guys. While there are probably a lot of gay male musicians who make a decent living gigging at gay bars and such, Rufus Wainwright is the only openly gay guy that I can think of who has had anything resembling much mainstream success. Compare that with lesbian acts like Melissa Ethridge or The Indigo Girls who sell zillions of CD's and play sold-out concerts night after night.