If I'm refuting that everyone in the world knows x, by showing a large population that doesn't know x. Saying that there is some other population that does know x makes no difference.
GP: all trucks are red.
Me: no, here's some trucks that are blue.
You: but look how many red trucks I see over there.
GP: all trucks are red. Me: no, here's some trucks that are blue. You: but look how many red trucks I see over there.