Sun, who told ABCNEWS.com that she believes the Memphis school district to be "homophobic," said that Nicholas' mother — who was "shocked" to hear that her son is gay — reported that Beasley said she "had a problem with homosexuality" and that "homosexuality will not be tolerated."
ABC News doesn't have the last names of the students, and the ACLU said both the boys and their parents declined to be interviewed for this story.
"It's raised our concerns about how gay students are treated," added Sun, who said that the ACLU will take legal action if they do not receive a response from the Memphis School District before May 9.
The school board, meanwhile, is sticking to its stance.
"It is the position of the Memphis City Schools that he principal did act in an appropriate manner in order to correct a serious issue [of public display of affection] at the school and that Memphis City Schools has not subjected either of these students to discriminatory treatment," said the school board's Turner in the statement.
A formal response will be drafted before the ACLU's deadline, Turner told ABCNEWS.com.