How do you deal with rude comments/sarcasm?

I moved to a new student housing with 11 people living in our hall. I am 22F and one of them is 33M and I don’t know what to do. The first few weeks I liked him, I appreciated him making jokes. But his sarcasm has come to a point where its not funny anymore and makes me feel hurt and uncomfortable. He makes comments about me being lazy and other things I won’t get into. I notice he makes these comments/‘jokes’ to others as well. I don’t care if I am too sensitive, someone who doesn’t know me can’t make these rude jokes. It is already the second time I told him to stop. And he said he will stop. But tonight I was studying late in the common room and he saw me and asked ‘still studying’, I said yes and he laughed at me… His age makes it even more uncomfortable to me.