So what is Brooks saying about New Yorkers and Jews?
In the long history of my people, there has never been one who was willing to appear less smart than he or she really is. We tend to go the other way.(Why "tend to" if there has "never been one"?) That's some serious stereotyping, but presumably Brooks thinks it's perfectly fine, because he's got "my people" immunity.
ADDED: The double "a" — "a a New Yorker" — is in the original NYT text.
AND: Hey, Brooks, did you know The 3 Stooges were Jewish?