My friend is randomly neglecting me?

Yesterday, I had some good news for my friend so I kept asking him to FaceTime me because I was really excited and wanted to see his face when I told him. He refused to answer though, so I just texted him what happened and he replied with "cool". That's it. Ever since, he's been sassing, replying to my texts very vaguely, and treating me like a stranger. For example, today I asked him what a TV show he likes is about, and usually he'd say something like, "well well well little missy. It's about _____ but you wouldn't know that cause you're a loooooseeeerrrr!!!" because that's how we talk to each other, but he said "watch it". I have a lot of other texts like this. They've made me really upset. What do I do?