Sorry for the vanity but I would like to prove this guy wrong.
My daughter's history teacher made this claim in class last week: "I don't believe Viet Nam veterans were mistreated when they came back from the war. I don' know any who were." I don't believe asteroids have ever landed on this planet and caused mass extinctions. I don't know any that landed.
This statement is about at the same level of idiocy as your daughter's teacher. If he didn't see it it doesn't exist?