Alright, well here's my two cents on how you could and should perceive this. A lot of people will spend their whole lives reacting to things. Sometimes, most of the time, people don't mean to be mean. Sometimes they just make a bad joke. It happens. When you see things from this perspective. With the perspective of giving people the benefit of the doubt and assuming that the intentions of their actions are not meant to harm you, but are simply a reflection of themselves. The world becomes a better place. You become much more forgiving, much more understanding. Much more at peace with yourself and with the world. People can in turn see and feel that. It becomes attractive and contagious. Or You can take it really personally. Hold a grudge against your teacher. Maybe come to resent him. Feel insecure. Bring it to the attention of the principle, school, other parents, etc. Prolong this and assume that the world is out to get you. Keep living this situation in your mind every day for the next few years. But you can let it go and assume no bad intent. That maybe your teacher was just trying to "be cool" with you but it backfired. Shit happens. I think life is simpler that way. Lighter. Easier. So moral of the story; Give people the benefit of the doubt, the first, second and maybe third time. If it proceeds, then try to understand their motivations. Once you understand the motivations of other people, you become at peace. Cheers mate.