It depends on the person. I did have a amazing high school math teacher who became interim director of the school who quite frequently used swear words. However

It depends on the person. I did have a amazing high school math teacher who became interim director of the school who quite frequently used swear words. However, he did it usually in a entertaining rather than raging way. He was very popular with the students and a very effective teacher. Others would never swear and yet others occasionally. Just like normal people outside of a school setting. No parents ever complained are were concerned about it. They were just happy their kids were learning shit.