Because it's you. [He doesn't sound affronted, because he isn't.] If it weren't, it would be interesting but not particularly relevant to me.

From what I can gather, the Caducans seemed more interested in their own glass than in the Creators per se. They said they were the most intelligent beings they had ever encountered... that implies more that the Caducans thought of them as beings who created things than that the Caducans considered them their own creators.