Getting made fun of today

Getting made fun of today So today I was sitting in band in a practice room with other band members and one of them asked where I went to elementary school. It starts with an “M” and stuttered on it. Not too terrible but very noticeable. A couple of them started mocking me impersonating the “m” stutter. I just laughed it off because I didn’t want to start a fight. I felt a little bad about anyway. I guess I laughed it off because that’s what I’m used to doing. What I’ve been doing for so many years now. I wanted to do something about it but I didn’t know how. Does anyone know the best way to deal with this?