I agree with you. A hall and parking lot monitor should not be discussing sex with the students, even if he is saying all the right things. His job is to monitor the hallways and parking lots, not teach sex ed.
However, I do think the school district was horribly wrong in trying to restrict him from his personal my space and from his Sunday School teaching. They do not own him, and his personal life is none of their business.
I do think it sends a message to the school district that the parents are unhappy with the current policy, which is great. He will have a much better opportunity to change things now.
So are you saying that all employees of the school including teachers should be restricted from talking to students except for the subjects they teach? It seems to me that there would be a lot of opportunity for a hall and parking lot monitor to interface with kids about sex. What is he supposed to be monitoring anyways. Heck in the 70’s the hall and parking lots is where kids would make out.