Husband feels weird with me around high schoolers

I’m almost done with school and recently made a career switch. I’ll be starting my credential program early next year and when casually discussing my future goals and simultaneously mentioned working at high school level, my husband started acting weird which prompted me to ask why he was being so weird and short all of a sudden. He told me that high schoolers are the worst batch and that he knows how they are. He was hard core implying that he didn’t feel comfortable with me being around high school boys. Which is SO WEIRD TO ME!!! Will be almost 30 by the time I start working (assuming I get a job soon after) and it just feels so comical yet frustrating that this is my life. I’ve never done a single thing to break his trust. I’ve been faithful our whole relationship. We have 2 kids. I don’t know why he’s like this. It’s not something he just casually mentioned and brushed off. He’s dead serious about it.