Rice's parents, Elden and Katherine Rice, also claim the public high school employed a double-standard because, they say, administrators never sought to shield Rebekah from teasing based on stereotypes about The Church of Jesus Christ of Latter-day Saints.

In addition, the Rices say their daughter was singled out because of the family's conservative views on sexuality. They are seeking unspecified damages and want the disciplinary notation expunged from Rebekah's school record.

Eliza Byard, deputy executive director of the New York-based Gay, Lesbian and Straight Education Network, said nearly nine out of 10 gay students her organization surveyed in 2005 reported hearing "That's so gay" or "You're so gay" frequently.

"It bothers them a lot," Byard said. "As odd or funny as the phrase sounds, imagine what it feels like to be in a setting where you consistently hear it used to describe something undesirable or stupid, and it also refers to you."

She said it is OK to discipline students for using the phrase after efforts have been made to educate them.

"The job of a school is to deal proactively and consistently with all forms of bullying, name-calling and harassment," she said.

Jordan Lorence, an attorney with the Alliance Defense Fund, a Christian legal organization, agreed "That's so gay" carries a negative meaning and said he would not want his children to say it. But he said formal discipline is not the answer.

"Reasonable people should say, 'Let's put a stop to this kind of search-and-destroy mission by school officials for everything that is politically incorrect,"' he said.