I'm going to snap at my teacher
What makes you want to snap at your teacher?
Because he was being so annoying when talking about something else in class.
When individuals respect the authority of social norms, it assures mutual security. The more respect you give your teacher, the more likely you'll get respect back.
I don't care what you say, I'm still going to snap at him.
I really think you should reconsider. If you snap at him you're just asking for trouble.