How do you deal with views that make you uncomfortable in classroom?

I am teaching a political science class as a TA leading discussion section and there’s this one student who will always make comments like “it’s good for world peace that this person died it’s like a side dish that comes with the burger” and he would giggle (very aggressively) at other students who hold different opinions when they speak up, what should I do about this?

We are covering a lot of challenging topics in this class that have actual impact on people’s lives, and this is extremely disturbing to me