"Why isn't a fireside chat a legitimate source?"
Duh - because it isn't written down, nor independently verifiable... It's anecdotal evidence, which is useless in debate...
I know they're kids, and therefore might not have worked this out yet - especially if he's trying to sweet-talk her - but you'd think that Denzel's teacher character would have explained this to them, there and then!
"Your mother puts license plates in your underwear? How do you sit?!"