Actually, that in both incorrect and moot
His typical interviews are with about 12-14 people and a few get snotty. The remainder make the air tape.
Secondly, even if he only took the worst 10%, America still deserves to know how bad our education system is, and that, despite their complete absence of information, intelligence and common sense, these fools are still allowed to vote!
Yes, I certainly agree with that! A story reporting that (say) 50% of Americans don't know the formula for water, that would be an important story.
But Watters instead just puts on some girl who thinks the formula for water is W. It's all for laughs, it's all about mocking the girl. It really doesn't tell us much about the American education system. It just tells us about that one girl.