I have a very high standard in my classroom and I get stressed when other instructors have low work ethics, i.e. allowing the students to leave early every day. These ethics are taught to the students and spill over into my classroom where I have to deal with them. Any suggestions?

I also get stressed when a student or students don't show an interest in a subject or assignment that is crucial to the curriculum. This lack of seriousness really stresses me out but it's like talking to a wall. I've tried every technique to reach them but with little or no results. I usually gravitate to the students that do want to learn as a way to justify myself and relieve stress. Any suggestions?