One of the authors of the popular American sitcom Friends from the 1990s, she admitted that the producers made a mistake in not using an appropriate substitute for Chandler's transgender parent in the show.
Marta Kaufman said she now regrets the way the character, played by Kathleen Turner, was portrayed.
"We kept calling her Chandler's dad, even though Chandler's dad was actually trans," she said.
"Pronouns were something I still didn't quite understand. So we didn't address the character in the female gender. That was a mistake."
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Kaufman gave an interview on the program "The Conversation" on the TV channel BBC World Service (BBC World News), which will be broadcast on July 11.
Actress Kathleen Turner appeared in the series in three episodes of the seventh season, first broadcast in 2001.
Her character was the subject of jokes from the other characters - for example, Chandler (played by Matthew Perry) and his mother joked about her gender identity and appearance.
In a 2018 interview, Turner said she would not take the role if offered again, and would leave it to a trans woman.
She also said that certain elements Friends they are not over time well ripened, noting that there was confusion over whether the character she portrayed was a drag queen or a trans woman.
"Yeah, people thought Charles just dressed like that," she told Gay Times (Gay Times).
This character is not explicitly confirmed in the series to be transgender, but is instead portrayed as a gay drag artist named Helena Handbasket who works in Las Vegas.
Kaufman, who is also the author of the Netflix series Grace and Frankie, she said that she would approach it differently if she were now working on To friends.
Speaking about a recent incident on the set of a TV show, she told the BBC that she "fired a guy on the spot because he made a joke about a transgender cameraman".
"It just can't be happening," she added.
She then stated yes Friends also "they don't have enough representation of dark-skinned people" and that she was "obviously part of the systemic racism in this business".
"I wasn't aware of that, which makes me feel stupid," she said, adding: "It was a very justified, extremely difficult criticism that I still react emotionally to."
"If I knew then what I know now, there are certain things I would change. But I didn't know and I've learned since then."
The interview came after Kaufman announced that she was donating four million dollars (3,9 million euros) to her alma mater, Brandeis in Massachusetts, to establish a professorship in the Department of African and Afro-American Studies.
"Confession and acceptance of guilt is not easy," she said last week to Los Angeles Times.
"It's painful to look in the mirror. I'm ashamed that I didn't know more 25 years ago."
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