Plutonium comes from Pluto
Sometimes, people are wrong about something and don’t understand why. We all make mistakes, and that’s OK. What’s not OK is insulting the person who gives you the correct information about a particular topic because you’re as stubborn as a mule.
This naive person thought that plutonium came from Pluto and insulted their daughter’s intelligence for not knowing that. We hate to break it to them, but plutonium is a manufactured element. Someone needs to go back to school, and it isn’t the daughter.