It's more just like Zoe being disrespectful and obnoxious. I mean we're talking about someone who goes on an emotional train wreck after finding out Ezreal has a thing or 2 for Lux here; she may be ancient, but her mentality doesn't seem to have progressed at all from the time she was made an aspect. The aspect, which is one representing trickery and stuff, may have specifically chose her precisely because this particular quality, that she is highly immature and almost will never learn their lessons.
So it can be easily assumed that Zoe's claims were really just trashtalking. And she doesn't say he made 0 stars, just not all; though I'd argue even if that is technically true, I'd still assume ASol actually forged the vast majority of the universe's stars.
I also don't believe that's the word, "arrogant", I'd say he was actually more innocent and naive than arrogant, considering his "arrogance" was essentially this "Oh this little creatures are thanking me for their existence, given I created the stars that made their lives possible? How cute! I will gladly accept their gifts".