Ever think someone was just joking, but then they block you?

Guy kept saying London was the center of the world, and when I asked him why he said because it was on the Prime Meridian. So I pointed out that the "center" of the world in that sense would actually be off the coast of Africa, near the coordinates 0,0. He told me not to mess with him, but then I pointed out how many other cities are also on the Prime Meridian, and so I got blocked. XD