Hundreds of students walked out of a Texas high school on Wednesday, claiming discrimination against queer students and teachers. Many of those protesting at MacArthur High School in Irving wore heart-shaped rainbow stickers on their faces — symbols of solidarity with LGBTQ students that were suddenly taken down from many teachers’ doors and windows. Texas TV station WFAA reports that teachers had put up the “safe space” stickers last year, including Rachel Stonecipher. She told a Dallas CBS affiliate that the Safe Space poster outside her classroom disappeared. “I was freaked. The kids were freaked out,” she said. “I was a little scared too because I’m the only openly, very obviously gay teacher, lesbian teacher.”