[Ross knows] evolution is true in most everyday contexts. It
is only in Phoebe's weird context that Ross does not know evolution is
true....
Flat earthers are pulling the same trick. They're right that you don't
know the earth is round. But they're only right in a context where
testimonies of hundreds are disregarded, where widely accepted facts
among the scientific community don't count, where photographic
evidence is inadmissible, and so on....
...But in that context, nobody knows much at all and so this
conclusion is simply unsurprising.