How to Stop Predating Children in Online Schools

I was talking to a substitute teacher about a book that I was reading for school. He said he had an assigned copy of the book in his car and wanted to show it to me. After 20 minutes, my dad freaked out when he saw a random middle-aged man talking to his teenage daughter. One silver lining of online school is as a substitute he's probably out of a job. It would make it much harder for him to predatorize children.