COLLEYVILLE, Texas (CBSDFW.COM) – A Colleyville Middle School teacher resigned Thursday, Feb. 24 after a video of something she said in a private conversation with colleagues in a hallway started spreading on social media. Grapevine-Colleyville ISD alerted families to the news in a statement it put out Thursday afternoon. In the video, it is difficult to hear all of the dialogue, but the group is heard blaming conservative Christians for the slow uptake of the COVID-19 vaccines