Well, it...it came from a frog! And frogs are yucky! Obviously!

[ The tone is still indignant, but it's clear that she's losing steam. His complete and total refusal to understand that frogs are just, like, super gross, ohmigod, is only making her reaction seem like the unusual one. And it's waaay too early in the morning to be self-aware, so she chooses to be annoyed with him instead. ]

How am I supposed to know that? It's not like I've ever been here before either.