Has anyone experienced this?

So I live next to one of my cousins, a guy, 2years younger. Anyway since he moved back to his parents house 2 years ago we've had arguments here and there. But every time after the argument when one of us turns around to leave (while we're still mad at each other). He always has to to tell me May God Bless you. He doesn't mean it in a sincere way. He uses it to be spiteful and get the last jab in there. I've told him that I don't use words that are meant as a holy gesture as a come back. Now he wants me to apologize.