This is an interesting conversation. Good taste is what we see and like … but also patterning after people we want to impress / be associated with, is it not?
Taste is very complex: it's hierarchical, social, not fixed, not absolute, not rational, is specific to audience and has irregular overlaps across groups, much of it (all?) derived from human sensation and context-specific situations.
The path to something being considered as good taste is generally not simple: much of it flows through lines of power/desire/moment whose branches are not easy to trace as they're being formed. Much of taste is the hidden "why" which most of us never see.
It's realistic that Dall-E could understand what trends are on the rise, or in good taste … it's much harder to say if Dall-E could create something of originally good taste.