Can you believe these shmucks?!

Americans think New Yorkers are the biggest jerks in the country, according to a new survey — released just days before Christmas, no less.

The slap-in-the-face Business Insider study found 34.3 percent of the knuckleheads who responded believe Big Apple residents are the rudest in the US.

But many locals were too polite to respond to the diss Monday.

“F–k off!” one man told a Post reporter on 125th Street in Harlem when asked his opinion of the study.