Archie Comics character Sabrina the Teenage Witch was the most gay-friendly of the 1990s teencoms, and not just because of the gay symbolism of outsider-with-a-secret, such as we see in that other witch sitcom, Bewitched.
It featured a surprising number of gay-friendly actors. I met Nate Richert (Sabrina's on-off boyfriend, Harvey) at a gay club in West Hollywood, and Jenna Leigh Green (her evil nemesis, Libby) spoke at UCLA during National Coming Out Week in 2000.
In the fall of 2000, Sabrina moved from ABC to the WB Network, the writers were replaced, along with most of the cast, and Sabrina becomes aggressively homophobic. She goes to the Rocky Horror Picture Show, and is disgusted by a man in the audience wearing garters!
The addition of David Lascher and Trevor Lissauer (right, in the gay-themed Eden's Curve) didn't help.
The homophobia has continued. Today Melissa Joan Hart is infamous for her homophobic (and otherwise nasty) jibes. In 2009 she complained about someone else taking credit for her husband Mark's song: "Mark fully wrote every bit of that song except the new lyrics in the chorus... which are gay anyhow. They turned it into a fairy love song."
She is currently paired with Joey Lawrence in the sitcom Melissa and Joey.
See also: Nate Richert's Kielbasa.