Did I overreact or not enough?

I was with my boyfriend and his friends today. We were all having a great time until one of his buddies had to make a very sick joke about car accidents. I simply voiced that I had lost a friend that way and they shouldn’t make fun of it because they don’t know how it hurts other people. His friend then decided to lay on the ground and make a disgusting sound mimicking the sound of something getting run over by a car. He then asked me “do you think it sounded like that?” and started laughing. The worst thing was that my boyfriend was laughing as well. I simply stayed quiet trying to keep myself from crying and going off on that guy. They continued making fun of car accidents and at one point they brought my friends name into a joke. My boyfriends friend was asking me what my friends name was, and my boyfriend told him. Then he got his other friend to pretend to be my friend who died. I literally wanted to kill him at this point. I was so shocked by the whole thing. My heart dropped into my chest and I wanted to cuss and scream and just go off. I didn’t though. What would you have done? How should I address my boyfriend for what he’s done?