Was made fun of in class

Was made fun of in class Today I was doing an interrogation in class. Just when I started I stuttered on Cicero's name, I was going to continue but I heard someone mocking me ("Ci-ci-cicero") from the seats behind me. I recognised his voice so I turned back to face him and looked at him for maybe two seconds, he was looking at me like I was going crazy, after looking at him to let him know that I had heard him I continued with my interrogation (which went good). A lot of people heard him too, but the teacher didn't. I didn't say anything to him, what he did is absolutely ridiculous in my opinion. The fact that a 16-years-old had to say something so moronic just to open his mouth is just so incredible.