I was a high school teacher many years ago. I found that it was okay because the classroom is not a casual social environment. There is a strict protocol and strict rules and as the teacher I was not socializing with the students but following lesson plans and the interactions were dictated by me and not them. Yes, there are people who disrupt and interrupt but the challenge is to keep everyone focused so that those are quickly dispatched with the same stock phrases that don't need to be improvised on the spot but are go-tos. The challenge is learning effective classroom management to keep troublemakers in their place. I don't mean to imply that I was a particularly strict teacher, but that I stayed focused and tried to keep the students focused on what needed to be accomplished during class time. The hardest classes to deal with were study hall and homeroom because there wasn't a task to be worked on.