“Hold on. YOUR PLANET RAINS WHAT?!!?!”
“Water. The highly corrosive, extremely reactive liquid.”
“I mean, yeah. But...”
“HOLD ON. WHY IS THE WATER ACIDIC? IS YOUR PLANET TRYING TO KILL YOU??!?”
“Oh that? It’s fine. Just the carbon dioxide in the air making it slightly acidic.”
“Umm... ph5 ish? So about x100 more concentrated than pure water? It’s honestly fine, if you think this is bad, you haven’t seen the ACTUAL acid rain on earth. That shit corrodes everything!” -- Anon Guest
The argument had been going on for some time. Not every species in the Galactic Alliance has a natural water cycle, and the results can lead to some interesting debate. It typically starts with, "Life just can't exist with a water cycle," followed by, "I am literally evidence against that statement."
Water ice, to the Propanite population of the Galactic Alliance, is deadly stuff. Toxic, reactive, and outright dangerous. Capable of causing great damage if heated. Capable of causing great damage even in its solid form. And worse happens if it's allowed to combine with extra oxygen and hydrogen molecules.
The human had a livesuit that kept them warm in the Propanite's ideal temperatures. "No lie. Liquid water comes out of our skies. Your rain? We used to use it for fuel. Now we use it to make long-chain hydrocarbon items for everyday necessity."